参数资料
型号: P89V51RB2BBC,557
厂商: NXP Semiconductors
文件页数: 25/80页
文件大小: 0K
描述: IC 80C51 MCU 1024 RAM 44TQFP
产品培训模块: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
标准包装: 800
系列: 89V
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 44-TQFP
包装: 托盘
配用: 622-1017-ND - BOARD 44-ZIF PLCC SOCKET
其它名称: 935277723557
P89V51RB2BBC
P89V51RB2BBC-ND
P89V51RB2_RC2_RD2_5
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 November 2009
31 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
6.5 Timer 2
Timer 2 is a 16-bit Timer/counter which can operate as either an event timer or an event
counter, as selected by C/T2 in the special function register T2CON. Timer 2 has four
operating modes: Capture, Auto-reload (up or down counting), Clock-out, and Baud Rate
Generator which are selected according to Table 19 using T2CON (Table 20 and
Fig 11. Timer/counter 0 mode 3 (two 8-bit counters)
002aaa522
osc/2
TR1
TR0
TnGate
INT0 pin
TL0
(8-bits)
TF0
control
overflow
interrupt
TH0
(8-bits)
TF1
control
overflow
interrupt
osc/6
T0 pin
C/T = 0
C/T = 1
Table 19.
Timer 2 operating mode
RCLK + TCLK
CP/RL2
TR2
T2OE
Mode
0
1
0
16-bit auto reload
0
1
0
16-bit capture
0
1
programmable clock-out
1
X
1
0
baud rate generator
X
0
X
off
Table 20.
T2CON - Timer/counter 2 control register (address C8H) bit allocation
Bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
TF2
EXF2
RCLK
TCLK
EXEN2
TR2
C/T2
CP/RL2
Table 21.
T2CON - Timer/counter 2 control register (address C8H) bit description
Bit
Symbol
Description
7
TF2
Timer 2 overow ag set by a Timer 2 overow and must be cleared by
software. TF2 will not be set when either RCLK or TCLK = 1 or when
Timer 2 is in Clock-out mode.
6
EXF2
Timer 2 external ag is set when Timer 2 is in capture, reload or
baud-rate mode, EXEN2 = 1 and a negative transition on T2EX
occurs. If Timer 2 interrupt is enabled EXF2 = 1 causes the CPU to
vector to the Timer 2 interrupt routine. EXF2 must be cleared by
software.
5
RCLK
Receive clock ag. When set, causes the UART to use Timer 2
overow pulses for its receive clock in modes 1 and 3. RCLK = 0
causes Timer 1 overow to be used for the receive clock.
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