P89V51RB2BBC,557 NXP Semiconductors, P89V51RB2BBC,557 Datasheet - Page 32

• Manufacturer Part Number: P89V51RB2BBC,557
• Description: IC 80C51 MCU 1024 RAM 44TQFP
• Manufacturer: NXP Semiconductors
• Series: 89Vr

Specifications of P89V51RB2BBC,557

• Program Memory Type: FLASH
• Program Memory Size: 16KB (16K x 8)
• Package / Case: 44-TQFP, 44-VQFP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Processor Series: P89V5x
• Core: 80C51
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: SPI, UART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 622-1017 - BOARD 44-ZIF PLCC SOCKET
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 935277723557; P89V51RB2BBC; P89V51RB2BBC

NXP Semiconductors
P89V51RB2_RC2_RD2_5
Product data sheet
6.5.1 Capture mode
Table 21.
Table 22.
Not bit addressable; Reset value: XX00 0000B
Table 23.
In the Capture mode there are two options which are selected by bit EXEN2 in T2CON. If
EXEN2 = 0 Timer 2 is a 16-bit timer or counter (as selected by C/T2 in T2CON) which
upon overflowing sets bit TF2, the Timer 2 overflow bit.
The capture mode is illustrated in
Bit
4
3
2
1
0
Bit
7 to 2
1
0
Bit
Symbol
T2CON - Timer/counter 2 control register (address C8H) bit description
T2MOD - Timer 2 mode control register (address C9H) bit allocation
T2MOD - Timer 2 mode control register (address C9H) bit description
Symbol
TCLK
EXEN2
TR2
C/T2
CP/RL2
Symbol
-
T2OE
DCEN
7
-
Rev. 05 — 12 November 2009
6
-
Description
Transmit clock flag. When set, causes the UART to use Timer 2
overflow pulses for its transmit clock in modes 1 and 3. TCLK = 0
causes Timer 1 overflows to be used for the transmit clock.
Timer 2 external enable flag. When set, allows a capture or reload to
occur as a result of a negative transition on T2EX if Timer 2 is not
being used to clock the serial port. EXEN2 = 0 causes Timer 2 to
ignore events at T2EX.
Start/stop control for Timer 2. A logic ‘1’ enables the timer to run.
Timer or counter select. (Timer 2)
Capture/Reload flag. When set, captures will occur on negative
transitions at T2EX if EXEN2 = 1. When cleared, auto-reloads will
occur either with Timer 2 overflows or negative transitions at T2EX
when EXEN2 = 1. When either RCLK = 1 or TCLK = 1, this bit is
ignored and the timer is forced to auto-reload on Timer 2 overflow.
Description
Reserved for future use. Should be set to ‘0’ by user programs.
Timer 2 Output Enable bit. Used in programmable clock-out mode
only.
Down Count Enable bit. When set, this allows Timer 2 to be configured
as an up/down counter.
0 = internal timer (f
1 = external event counter (falling edge triggered; external clock’s
maximum rate = f
Figure
5
-
12.
osc
P89V51RB2/RC2/RD2
4
-
osc
/ 12
/ 6)
8-bit microcontrollers with 80C51 core
3
-
2
-
© NXP B.V. 2009. All rights reserved.
T2OE
1
…continued
DCEN
32 of 80
0