AT87F52-12AC ATMEL [ATMEL Corporation], AT87F52-12AC Datasheet
AT87F52-12AC
Related parts for AT87F52-12AC
AT87F52-12AC Summary of contents
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... Flash allows the program memory to be user programmed by a conventional nonvola- tile memory programmer. By combining a versatile 8-bit CPU with QuickFlash on a monolithic chip, the Atmel AT87F52 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications. ...
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... Block Diagram V CC GND RAM ADDR. REGISTER B REGISTER PSEN TIMING ALE/PROG INSTRUCTION AND REGISTER CONTROL RST OSC AT87F52 2 P0.0 - P0.7 PORT 0 DRIVERS PORT 2 PORT 0 RAM LATCH LATCH ACC TMP2 TMP1 ALU INTERRUPT, SERIAL PORT, AND TIMER BLOCKS PSW PORT 1 LATCH PORT 1 DRIVERS P1 ...
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... QuickFlash, 256 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level interrupt archi- tecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT87F52 is designed with static logic for operation down to zero frequency and sup- ports two software selectable power saving modes. The ...
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... PSEN Program Store Enable is the read strobe to external pro- gram memory. When the AT87F52 is executing code from external pro- gram memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. ...
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... When either RCLK or TCLK = 1, this bit is ignored and the timer is forced to auto-reload on Timer 2 overflow. Data Memory The AT87F52 implements 256 bytes of on-chip RAM. The upper 128 bytes occupy a parallel address space to the Special Function Registers. That means the upper 128 bytes have the same addresses as the SFR space but are physically separate from SFR space ...
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... Timer 0 and 1 Timer 0 and Timer 1 in the AT87F52 operate the same way as Timer 0 and Timer 1 in the AT87F51. Timer 2 Timer 16-bit Timer/Counter that can operate as either a timer or an event counter. The type of operation is selected by bit C/T2 in the SFR T2CON (shown in Table 2). ...
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Figure 2 shows Timer 2 automatically counting up when DCEN = 0. In this mode, two options are selected by bit EXEN2 in T2CON. If EXEN2 = 0, Timer 2 counts up to 0FFFFH and then sets the TF2 bit ...
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... C/ PIN Figure 4. Timer 2 in Baud Rate Generator Mode NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12 ÷ 2 OSC C/ C/ PIN TRANSITION DETECTOR T2EX PIN AT87F52 8 (DOWN COUNTING RELOAD VALUE) 0FFH 0FFH OVERFLOW TH2 TL2 CONTROL TR2 RCAP2H RCAP2L (UP COUNTING RELOAD VALUE) TH2 ...
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Baud Rate Generator Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON (Table 2). Note that the baud rates for transmit and receive can be different if Timer 2 is used for the ...
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... RCAP2H and RCAP2L. Interrupts The AT87F52 has a total of six interrupt vectors: two exter- nal interrupts (INT0 and INT1), three timer interrupts (Tim- ers 0, 1, and 2), and the serial port interrupt. These inter- rupts are all shown in Figure 6 ...
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Oscillator Characteristics XTAL1 and XTAL2 are the input and output, respectively inverting amplifier that can be configured for use as an on-chip oscillator, as shown in Figure 7. Either a quartz crystal or ceramic resonator may be used. ...
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... Program Memory Lock Bits The AT87F52 has three lock bits that can be left unpro- grammed (U) or can be programmed (P) to obtain the addi- tional features listed in the following table. Lock Bit Protection Modes Program Lock Bits LB1 LB2 LB3 Protection Type program lock features ...
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Programming Interface Every code byte in the QuickFlash array can be pro- grammed by using the appropriate combination of control signals. The write operation cycle is self-timed and once initiated, will automatically time itself to completion. QuickFlash Programming Modes Mode ...
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... Figure 10. Verifying the QuickFlash Memory + ADDR. OOOOH/1FFFH PGM P0 DATA ALE PROG SEE FLASH PROGRAMMING MODES TABLE 3-24 MHz RST V IH PSEN PP +5V AT87F52 PGM DATA P0 P2.0 - P2.4 (USE 10K A8 - A12 PULLUPS) P2.6 P2.7 ALE P3.6 P3.7 XTAL 2 EA XTAL1 RST GND PSEN Min Max Units 11 ...
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QuickFlash Programming and Verification Waveforms P1.0 - P1.7 P2.0 - P2.4 PORT 0 ALE/PROG EA/V PP P2.7 (ENABLE) P3.4 (RDY/BSY) PROGRAMMING ADDRESS DATA DVGL GHDX t AVGL t SHGL t GLGH V PP (2) t EHSH t ...
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... Port Ports Maximum total I for all output pins exceeds the test condition than the listed test conditions. 2. Minimum V for Power Down is 2V. CC AT87F52 16 *NOTICE: = -40°C to 85°C and Condition (Except EA) (Except XTAL1, RST) (XTAL1, RST ...
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AC Characteristics Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other outputs = 80 pF. External Program and Data Memory Characteristics Symbol Parameter 1/t Oscillator Frequency CLCL t ALE Pulse ...
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... External Program Memory Read Cycle t LHLL ALE t AVLL PSEN PORT 0 PORT 2 External Data Memory Read Cycle t LHLL ALE PSEN RD t AVLL PORT FROM RI OR DPL PORT 2 P2 A15 FROM DPH AT87F52 18 t LLIV t LLPL t PLIV t PLAZ t PXIZ t LLAX t PXIX INSTR IN t AVIV A8 - A15 ...
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External Data Memory Write Cycle t LHLL ALE PSEN WR t AVLL PORT FROM RI OR DPL PORT 2 P2 A15 FROM DPH External Clock Drive Waveforms t CHCX V - ...
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... CC 0 TEST POINTS 0 0.45V Note Inputs during testing are driven at V for a logic 1 and 0.45V for a logic 0. Timing mea- surements are made at V max. for a logic 0. AT87F52 20 = 5.0V 20% and Load Capacitance = 80 pF MHz Osc Min 1.0 700 ...
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... Lead, Thin Plastic Gull Wing Quad Flatpack (TQFP) 44J 44 Lead, Plastic J-Leaded Chip Carrier (PLCC) 40P6 40 Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) Ordering Code AT87F52-12AC AT87F52-12JC AT87F52-12PC AT87F52-12AI AT87F52-12JI AT87F52-12PI AT87F52-16AC AT87F52-16JC AT87F52-16PC AT87F52-16AI AT87F52-16JI AT87F52-16PI ...
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... SEATING PLANE .161(4.09) .125(3.18) .065(1.65) .110(2.79) .041(1.04) .090(2.29) .630(16.0) .590(15.0) .012(.305) .008(.203) .690(17.5) .610(15.5) AT87F52 22 44J, 44-Lead, Plastic J-Leaded Chip Carrier (PLCC) Dimensions in Inches and (Millimeters) .032(.813) .026(.660) .050(1.27) TYP PIN 1 .566(14.4) .530(13.5) .090(2.29) MAX .005(.127) MIN ...