P87LPC768 NXP Semiconductors, P87LPC768 Datasheet
P87LPC768
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P87LPC768 Summary of contents
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... P87LPC768 Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D,and Pulse Width Modulator Preliminary data Supersedes data of 2001 Aug 06 hilips Semiconductors INTEGRATED CIRCUITS 2002 Mar 12 ...
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... Preliminary data P87LPC768 ...
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... The P87LPC768 is a 20-pin single-chip microcontroller designed for low pin count applications demanding high-integration, low cost solutions over a wide range of performance requirements. A member of the Philips low pin count family, the P87LPC768 offers programmable oscillator configurations for high and low speed crystals or RC operation, wide operating voltage range, programmable port output configurations, selectable Schmitt trigger inputs, LED drive outputs, and a built-in watchdog timer ...
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... V P0.5/CMPREF/AD2 X1/P2 X2/CLKOUT/P2.0 P0.6/CMP1/AD3 8 13 INT1/P1.4 P0.7/ SDA/INT0/P1.3 P1.0/TxD 10 11 SCL/T0/P1.2 P1.1/RxD SU01361 Preliminary data P87LPC768 Drawing Number SOT146–1 SOT163–1 SOT146–1 SOT163–1 SCL TxD SDA RxD T0 INT0 INT1 RST PWM1 PWM2 SU01362 ...
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... PORT 0 CONFIGURABLE I/OS KEYPAD INTERRUPT CONFIGURABLE CRYSTAL OR OSCILLATOR RESONATOR 2002 Mar 12 ACCELERATED 80C51 CPU INTERNAL BUS TIMER 0, 1 WATCHDOG TIMER AND OSCILLATOR ANALOG COMPARATORS CONVERTER PULSE WIDTH MODULATOR ON-CHIP POWER MONITOR RC (POWER-ON RESET, OSCILLATOR BROWNOUT RESET) 3 Preliminary data P87LPC768 UART A/D SU01363 ...
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... ON-CHIP CODE MEMORY SPACE * The P87LPC768 does not support access to external data memory. However, the User Configuration Bytes are accessed via the MOVX instruction as if they were in external data memory. Figure 1. P87LPC768 Program and Data Memory Map 2002 Mar 12 FFh ...
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... External Reset input (if selected via EPROM configuration). A low on this pin resets the microcontroller, causing I/O ports and peripherals to take on their default states, and the processor begins execution at address 0. When used as a port pin, P1 Schmitt trigger input only. PWM1 Pulse Width Modulator 1 output PWM2 Pulse Width Modulator 2 output 5 Preliminary data P87LPC768 ...
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... EPROM configuration). CLKOUT CPU clock divided by 6 clock output when enabled via SFR bit and in conjunction with internal RC oscillator or external clock input. X1 Input to the oscillator circuit and internal clock generator circuits (when selected via the EPROM configuration). 6 Preliminary data P87LPC768 ...
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... PWD PBO PS B7h – PWDH PBOH PSH F8h PTI – PC1 PAD F7h PTIH – PC1H PADH 7 Preliminary data P87LPC768 Reset Value LSB 00h ADCS RCCLK AADR1 AADR0 00h 1 SRST 0 – DPS 02h F3 F2 ...
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... TF1 TR1 TF0 TR0 8Ch 8Dh 8Ah 8Bh 89h GATE C A7h – – WDOVF WDRUN A6h 8 Preliminary data P87LPC768 Reset Value LSB 00h CIN1B CIN2A CIN2B CMP2 Note INT0 T0 RxD TxD Note – ...
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... The P87LPC768 uses an enhanced 80C51 CPU which runs at twice the speed of standard 80C51 devices. This means that the performance of the P87LPC768 running at 5 MHz is exactly the same as that of a standard 80C51 running at 10 MHz. A machine cycle consists of 6 oscillator cycles, and most instructions execute clocks ...
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... Table 1. In Table 1, maximum times for RCCLK = 1 use an RC clock frequency of 4.5 MHz (6 MHz - 25%). Minimum times for RCCLK = 1 use an RC clock frequency of 7.5 MHz (6 MHz + 25%). Nominal time assume an ideal RC clock frequency of 6 MHz and an average of 3.5 machine cycles at the CPU clock rate. 10 Preliminary data P87LPC768 RCCLK AADR1 ...
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... A/D accuracy is also affected by noise generated elsewhere in the application, power supply noise, and power supply regulation. Since the P87LPC768 power pins are also used as the A/D reference and supply, the power supply has a very direct affect on the accuracy of A/D readings. Using the A/D without Power Down mode while the clock is divided through the use of CLKR or DIVM has an adverse effect on A/D accuracy ...
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... Get A/D result, ; and save it in memory. ; Clear the A/D completion flag. ; Clear the A/D channel number. ; Restore accumulator. ; Add in the new channel number. ; Start A/D conversion. ; Wait for ADCI to be set. ; Get A/D result. ; Clear the A/D completion flag. ; Clear the A/D channel number. 12 Preliminary data P87LPC768 ...
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... Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D, Pulse Width Modulator Analog Comparators Two analog comparators are provided on the P87LPC768. Input and output options allow use of the comparators in a number of different configurations. Comparator operation is such that the output is a ...
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... COn CMPREF CINnA COn V (1.23V) ref CINnB COn CMPREF CINnB COn V (1.23V) ref Figure 6. Comparator Configurations 14 Preliminary data P87LPC768 CMP1 (P0.6) CMF1 INTERRUPT CMP2 (P0.0) CMF2 INTERRUPT SU01153 CPn, CNn, OEn = COn CMPn – CPn, CNn, OEn = COn CMPn – CPn, CNn, OEn = ...
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... EA ret Pulse Width Modulator The P87LPC768 contains four Pulse Width Modulated (PWM) channels which generate pulses of programmable length and interval. The output for PWM0 is on P0.1, PWM1 on P1.6, PWM2 on P1.7 and PWM3 on P0.0. After chip reset the internal output of the each PWM channel is a “1.” Note that the state of the pin will not reflect this if UCFG1.5, PRHI, is set to a zero. In this case before the pin will reflect the state of the internal PWM output a “ ...
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... REGISTER REGISTER 10 BIT COMPARE 10 BIT COMPARE REGISTER REGISTER A>B PWM3I PWM2I BKEN PWM3B PWM2B 2:1 MUX 2:1 MUX PWM3 PWM2 Figure 8. PWM Block Diagram 16 Preliminary data P87LPC768 CNSW2 CNSW1 CNSW0 Unused CNSW9 CNSW8 10 BIT SHADOW REGISTER 10 BIT COMPARE REGISTER A>B A>B PWM1I ...
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... Transfer, PWMCON0.7, be set when PWMCON0 is written. When the Run bit, PWMCON0.7, is cleared the PWM outputs take on the state they had just prior to the bit being cleared. In general this state is not known. In order to place the outputs in a known 17 Preliminary data P87LPC768 CPSW02 CPSW01 ...
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... Rewrite PWMCON1 to change from Brake Pin enabled to S/W Brake Write CPSW.(0:4) to always “1” always “0” give brake pattern Set PWMCON0 to enable Run and Transfer. Poll Brake Pin until longer active. When no longer active: 18 Preliminary data P87LPC768 – PWM1I PWM0I – ...
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... Brake Pin may be required to ensure that there is a smooth transition in going from brake to run. The details for PWMCON1 are shown in the following table BKPS BPEN BKEN PWM3B BRAKE CONDITION 19 Preliminary data P87LPC768 PWM2B PWM1B PWM0B SU01388 ...
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... The first five of these times are 4.7 ms (see I are covered by the low order three bits of timer I. Timer I is clocked by the P87LPC768 CPU clock. Timer I can be pre-loaded with one of four values to optimize timing for different oscillator frequencies. At lower frequencies, software response time is increased and will degrade maximum performance of the I register I2CFG description for prescale values (CT0, CT1) ...
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... STR, or STP is set, clearing DRDY will not release SCL to high that the I C will not the next bit program detects ATN = 1, and DRDY = 0, it should examine ARL, STR, and STP. 21 Preliminary data P87LPC768 Reset Value: 81h 1 0 — XSTR XSTP 2 ...
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... XDAT = 0; it sets Transmit Active and drives SDA low during the SCL low time. After SCL goes high, the I hardware waits for the suitable minimum time and then releases SDA to high to make the stop condition. 22 Preliminary data P87LPC768 2 C interface will only drive 2 C hardware to 2 ...
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... SCL when this device is a master on the I controls both of these parameters, and also the timing for stop and start conditions. Regarding Software Response Time Because the P87LPC768 can run at 20 MHz, and because the I interface is optimized for high-speed operation quite likely that 2 ...
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... Interrupts The P87LPC768 uses a four priority level interrupt structure. This allows great flexibility in controlling the handling of the P87LPC768’s many interrupt sources. The P87LPC768 supports interrupt sources. Each interrupt source can be individually enabled or disabled by setting or clearing a bit in registers IEN0 or IEN1. The IEN0 register also contains a global disable bit, EA, which disables all interrupts at once ...
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... IEn when the interrupt is level sensitive, it simply tracks the input pin level external interrupt is enabled when the P87LPC768 is put into Power Down or Idle mode, the interrupt will cause the processor to wake up and resume operation. Refer to the section on Power Reduction Modes for details ...
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... Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D, Pulse Width Modulator I/O Ports The P87LPC768 has 3 I/O ports, port 0, port 1, and port 2. The exact number of I/O pins available depend upon the oscillator and reset options chosen. At least 15 pins of the P87LPC768 may be used as I/Os when a two-pin external oscillator and an external reset circuit are used ...
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... The last two functions are described in the Timer/Counters and Oscillator sections respectively. The enable bits for all of these functions are shown in Figure 16. Each I/O port of the P87LPC768 may be selected to use TTL level inputs or Schmitt inputs with hysteresis. A single configuration bit determines this selection for the entire port. Port pins P1.2, P1.3, and P1 ...
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... P0S When P0S = 1, this bit enables Schmitt trigger inputs on Port 0. P2M1.4 ENCLK When ENCLK is set and the P87LPC768 is configured to use the on-chip RC oscillator, a clock output is enabled on the X2 pin (P2.0). Refer to the Oscillator section for details. P2M1.3 ENT1 When set, the P.7 pin is toggled whenever Timer 1 overflows. The output frequency is therefore one half of the Timer 1 overflow rate ...
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... Note: the Keyboard Interrupt must be enabled in order for the settings of the KBI register to be effective. The interrupt flag (KBF) is located at bit 7 of AUXR1. 2002 Mar 12 EKB (FROM IEN1 REGISTER) Figure 17. Keyboard Interrupt KBI.5 KBI.4 KBI.3 KBI.2 KBI.1 Figure 18. Keyboard Interrupt Register (KBI) 29 Preliminary data P87LPC768 KBF (KBI INTERRUPT) SU01163 Reset Value: 00h 1 0 KBI.0 SU01164 ...
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... A clock output on the X2/P2.0 pin may be enabled when the external clock input is used. Clock Output The P87LPC768 supports a clock output function when either the on-chip RC oscillator or external clock input options are selected. This allows external devices to synchronize to the P87LPC768. ...
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... A CLOCK OUTPUT MAY BE OBTAINED ON THE X2 PIN BY SETTING THE ENCLK BIT IN THE P2M1 REGISTER. 2002 Mar 12 QUARTZ CRYSTAL OR CERAMIC RESONATOR Figure 19. Using the Crystal Oscillator CMOS COMPATIBLE EXTERNAL OSCILLATOR SIGNAL Figure 20. Using an External Clock Input 31 Preliminary data P87LPC768 87LPC768 SU01389 87LPC768 X1 X2 SU01390 ...
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... P87LPC768 instruction and peripheral timing to match standard 80C51 timing by dividing the CPU clock by two. Default timing for the P87LPC768 is 6 CPU clocks per machine cycle while standard 80C51 timing is 12 clocks per machine cycle. This division also applies to peripheral timing, allowing 80C51 code that is oscillator frequency and/or timer rate dependent ...
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... When this feature is activated, the POF flag in the PCON register is set to indicate an initial power up condition. The POF flag will remain set until cleared by software. Power Reduction Modes The P87LPC768 supports Idle and Power Down modes of power reduction. Idle Mode The Idle mode leaves peripherals running in order to allow them to activate the processor when an interrupt is generated ...
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... The corresponding interrupt must be enabled. Reset Input The external reset input must be enabled. A/D converter Must use internal RC clock (RCCLK = 1) for A/D converter to work in Power Down mode. The A/D must be enabled and properly set up. The corresponding interrupt must be enabled. 2002 Mar 12 34 Preliminary data P87LPC768 ...
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... While the signal on the RST pin is less than low, the P87LPC768 is held in reset until the signal goes high. The watchdog timer on the P87LPC768 can act as an oscillator fail detect because it uses an independent, fully on-chip oscillator. UCFG1 is described in the System Configuration Bytes section of this datasheet. ...
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... Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D, Pulse Width Modulator Timer/Counters The P87LPC768 has two general purpose counter/timers which are upward compatible with the standard 80C51 Timer 0 and Timer 1. Both can be configured to operate either as timers or event counters (see Figure 25) ...
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... Figure 27. There are two different GATE bits, one for Timer 1 (TMOD.7) and one for Timer 0 (TMOD.3 TF0 TR0 IE1 IT1 IE0 TLn THn (5 BITS) (8 BITS) CONTROL TOGGLE 37 Preliminary data P87LPC768 Reset Value: 00h 0 IT0 SU01172 OVERFLOW TFn INTERRUPT Tn PIN TnOE SU01173 ...
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... Mode 3 is provided for applications that require an extra 8-bit timer. With Timer 0 in Mode 3, an P87LPC768 can look like it has three Timer/Counters. When Timer Mode 3, Timer 1 can be turned on and off by switching it into and out of its own Mode 3. It can still be used by the serial port as a baud rate generator any application not requiring an interrupt ...
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... The port outputs will be a logic 1 prior to the first timer overflow when this mode is turned on. UART The P87LPC768 includes an enhanced 80C51 UART. The baud rate source for the UART is timer 1 for modes 1 and 3, while the rate is fixed in modes 0 and 2. Because CPU clocking is different on the P87LPC768 than on the standard 80C51, baud rate calculation is somewhat different ...
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... SM2 REN TB8 RB8 Baud Rate CPU clock/6 Variable (see text) CPU clock/32 or CPU clock/16 Variable (see text) Figure 31. Serial Port Control Register (SCON) 40 Preliminary data P87LPC768 Reset Value: 00h SU01157 ...
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... Preliminary data P87LPC768 CPU clock frequency 192 ( SMOD1 + 1) 256 * (TH1) 38.4k 57.6k * 7.3728 * 11.0592 * 14.7456 – – – – – – – – – – ...
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... Preliminary data P87LPC768 57.6k 115.2k 5.5296 * 11.0592 * 11.0592 – 16.5888 – – – – – – – – – – – – – ...
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... Ten bits are transmitted (through TxD), or received (through RxD): a start bit (0), 8 data bits (LSB first), and a stop bit (1). On receive, the stop bit goes into RB8 in SCON. In the P87LPC768 the baud rate is determined by the Timer 1 overflow rate. Figure 33 shows a simplified functional diagram of the serial port in Mode 1, and associated timings for transmit receive ...
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... INTERNAL BUS S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... S6 S1 ... Figure 32. Serial Port Mode 0 44 Preliminary data P87LPC768 RxD P1.1 ALT OUTPUT FUNCTION TxD P1.0 ALT OUTPUT FUNCTION SHIFT CLOCK RXD P1.1 ALT INPUT FUNCTION S1 ... S6 S1 ... S6 S1 ... S6 TRANSMIT D7 RECEIVE D6 ...
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... INPUT SHIFT REGISTER DETECTOR LOAD SBUF SBUF READ SBUF 80C51 INTERNAL BUS Figure 33. Serial Port Mode 1 45 Preliminary data P87LPC768 TxD P1.0 ALT OUTPUT FUNCTION SERIAL PORT INTERRUPT TRANSMIT D6 D7 STOP BIT D6 D7 STOP BIT RECEIVE SU01179 ...
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... SM2 has no effect in Mode 0, and in Mode 1 can be used to check the validity of the stop bit, although this is better done with the Framing Error flag Mode 1 reception, if SM2 = 1, the receive interrupt will not be activated unless a valid stop bit is received. 46 Preliminary data P87LPC768 ...
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... INPUT SHIFT REGISTER LOAD SBUF SBUF READ SBUF 80C51 INTERNAL BUS Figure 34. Serial Port Mode 2 47 Preliminary data P87LPC768 TxD P1.0 ALT OUTPUT FUNCTION SERIAL PORT INTERRUPT TRANSMIT D6 D7 TB8 STOP BIT D6 D7 RB8 STOP BIT RECEIVE SU01180 ...
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... INPUT SHIFT REGISTER DETECTOR LOAD SBUF SBUF READ SBUF 80C51 INTERNAL BUS Figure 35. Serial Port Mode 3 48 Preliminary data P87LPC768 TxD P1.0 ALT OUTPUT FUNCTION SERIAL PORT INTERRUPT TRANSMIT D6 D7 TB8 STOP BIT D6 D7 RB8 STOP BIT RECEIVE SU01181 ...
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... If the CPU clock was still running, code execution will begin immediately after that. If the processor was in Power Down mode, the watchdog reset will start the oscillator and code execution will resume after the oscillator is stable. 49 Preliminary data P87LPC768 ...
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... Minimum Time Nominal Time 131 ms 165 ms 262 ms 330 ms 524 ms 660 ms 1.05 sec 1.3 sec 2.1 sec 50 Preliminary data P87LPC768 WATCHDOG RESET WATCHDOG INTERRUPT WDTE (UCFG1.7) S WDOVF Q (WDCON.5) R SU01635 1 0 WDS0 Maximum Time 180 ms 360 ms 719 ms 1 ...
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... See the Power Reduction Modes section for details. AUXR1.3 SRST Software Reset. When set by software, resets the P87LPC768 hardware reset occurred. AUXR1.2 — This bit contains a hard-wired 0. Allows toggling of the DPS bit by incrementing AUXR1, without interfering with other bits in the register ...
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... UCFG bytes are programmed. System Configuration Bytes A number of user configurable features of the P87LPC768 must be defined at power up and therefore cannot be set by the program after start of execution. Those features are configured through the use of two EPROM bytes that are programmed in the same manner as the EPROM program space ...
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... Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise noted. 2002 Mar — — — — — Protection Description 53 Preliminary data P87LPC768 Unprogrammed Value: FFh 0 — SU01186 RATING UNIT –55 to +125 C –65 to +150 +11.0 V –0 +0.5V ...
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... MHz or less are guaranteed to continue to execute instructions correctly OSC = 2 not guaranteed + – +85 C, unless otherwise specified amb 54 Preliminary data P87LPC768 LIMITS UNIT UNIT 1,2 MIN TYP MAX ...
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... A source impedance higher than this driving an A/D input may result in loss of precision and erroneous readings. 2002 Mar 12 TEST CONDITIONS TEST CONDITIONS 1 0 < V < TEST CONDITIONS TEST CONDITIONS A/D enabled 100kHz 55 Preliminary data P87LPC768 LIMITS UNIT UNIT MIN TYP MAX –0 –50 dB 250 ...
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... Center of a step of the actual transfer curve. 2002 Mar 12 (2) (1) (5) (4) (3) 1 LSB (ideal) 250 251 (LSB ) IN ideal 1 LSB = ). e Figure 41. A/D Conversion Characteristics 56 Preliminary data P87LPC768 Offset Gain error error 252 253 254 255 256 256 SU01355 ...
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... Parts are guaranteed to operate down to 0 Hz. 4. Applies only to an external clock source, not when a crystal is connected to the X1 and X2 pins. 2002 Mar 6.0 V unless otherwise specified PARAMETER PARAMETER = Preliminary data P87LPC768 LIMITS UNIT UNIT MIN MAX 0 20 MHz 0 10 ...
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... CHCL CLCX t C Figure 43. External Clock Timing 1000 6.0 V 5.0 V 100 4.0 V 3 100 100 SU01202 Figure 45. Typical medium frequency oscillator Idd Preliminary data P87LPC768 SET TI VALID VALID VALID SET RI SU01187 t CHCX t CLCH SU01188 6.0 V 6.0 V 5.0 V 5.0 V 4.0 V 3 ...
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... SU01205 Figure 50. Typical Idle Idd versus frequency (external clock, NOTE: 4 Total Idd at sum of oscillator current and active or idle current 3.3 V shown in Figures 47, 48 appropriate 2.7 V 10,000 SU01206 59 Preliminary data P87LPC768 4.0 V 3.3 V 2.7 V 100 1,000 10,000 Frequency (kHz) SU01207 25 C, LPEP=1) 5.0 V 4 ...
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... Philips Semiconductors Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D, Pulse Width Modulator DIP20: plastic dual in-line package; 20 leads (300 mil) 2002 Mar 12 60 Preliminary data P87LPC768 SOT146-1 ...
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... Philips Semiconductors Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D, Pulse Width Modulator SO20: plastic small outline package; 20 leads; body width 7.5 mm 2002 Mar 12 61 Preliminary data P87LPC768 SOT163-1 ...
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... Low power, low price, low pin count (20 pin) microcontroller with 4 kB OTP 8-bit A/D, Pulse Width Modulator REVISION HISTORY Date CPCN 2002 Mar 12 9397 750 09558 2001 Aug 06 9397 750 08661 2002 Mar 12 Description – Added revision history – Updated Reset section Previous release 62 Preliminary data P87LPC768 ...
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... Mar components conveys a license under the Philips’ system provided the system conforms to the Fax: + 24825 Document order number: 63 Preliminary data P87LPC768 2 C patent Koninklijke Philips Electronics N.V. 2002 All rights reserved. Printed in U.S.A. Date of release: 03-02 9397 750 09558 ...