P89V51RB2BBC,557 NXP Semiconductors, P89V51RB2BBC,557 Datasheet - Page 35

• 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
Fig 14. Timer 2 in Auto Reload mode (DCEN = 1)
OSC
T2 pin
6.5.3 Programmable clock-out
6.5.4 Baud rate generator mode
6
When a logic 0 is applied at pin T2EX this causes Timer 2 to count down. The timer will
underflow when TL2 and TH2 become equal to the value stored in RCAP2L and
RCAP2H. Timer 2 underflow sets the TF2 flag and causes 0FFFFH to be reloaded into
the timer registers TL2 and TH2. The external flag EXF2 toggles when Timer 2 underflows
or overflows. This EXF2 bit can be used as a 17th bit of resolution if needed.
A 50 % duty cycle clock can be programmed to come out on pin T2 (P1.0). This pin,
besides being a regular I/O pin, has two additional functions. It can be programmed:
To configure the Timer/counter 2 as a clock generator, bit C/T2 (in T2CON) must be
cleared and bit T2OE in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to start
the timer.
The Clock-Out frequency depends on the oscillator frequency and the reload value of
Timer 2 capture registers (RCAP2H, RCAP2L) as shown in
Where (RCAP2H,RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
In the Clock-Out mode Timer 2 roll-overs will not generate an interrupt. This is similar to
when it is used as a baud-rate generator.
Bits TCLK and/or RCLK in T2CON allow the UART) transmit and receive baud rates to be
derived from either Timer 1 or Timer 2 (See
When TCLK = 0, Timer 1 is used as the UART transmit baud rate generator. When
---------------------------------------------------------------------------------------- -
2
1. To input the external clock for Timer/counter 2, or
2. To output a 50 % duty cycle clock ranging from 122 Hz to 8 MHz at a 16 MHz
operating frequency.
65536
OscillatorFrequency
C/T2 = 0
C/T2 = 1
RCAP2H RCAP2L
Rev. 05 — 12 November 2009
TR2
control
(down-counting reload value)
(up-counting reload value)
RCAP2L RCAP2H
(8-bits)
FFH
TL2
(8-bits)
FFH
TH2
P89V51RB2/RC2/RD2
Section 6.6 “UARTs” on page 37
8-bit microcontrollers with 80C51 core
underflow
overflow
T2EX pin
Equation
count direction
1 = up
0 = down
toggle
TF2
2:
© NXP B.V. 2009. All rights reserved.
002aaa525
EXF2
timer 2
interrupt
for details).
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