参数资料
型号: P89V51RB2BBC,557
厂商: NXP Semiconductors
文件页数: 26/80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
32 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
6.5.1 Capture mode
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 overowing sets bit TF2, the Timer 2 overow bit.
The capture mode is illustrated in Figure 12.
4
TCLK
Transmit clock ag. When set, causes the UART to use Timer 2
overow pulses for its transmit clock in modes 1 and 3. TCLK = 0
causes Timer 1 overows to be used for the transmit clock.
3
EXEN2
Timer 2 external enable ag. 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.
2
TR2
Start/stop control for Timer 2. A logic ‘1’ enables the timer to run.
1C/T2
Timer or counter select. (Timer 2)
0 = internal timer (fosc / 6)
1 = external event counter (falling edge triggered; external clock’s
maximum rate = fosc / 12
0
CP/RL2
Capture/Reload ag. When set, captures will occur on negative
transitions at T2EX if EXEN2 = 1. When cleared, auto-reloads will
occur either with Timer 2 overows 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 overow.
Table 22.
T2MOD - Timer 2 mode control register (address C9H) bit allocation
Not bit addressable; Reset value: XX00 0000B
Bit
7
6
5
4
3
2
1
0
Symbol
-
T2OE
DCEN
Table 23.
T2MOD - Timer 2 mode control register (address C9H) bit description
Bit
Symbol
Description
7 to 2
-
Reserved for future use. Should be set to ‘0’ by user programs.
1
T2OE
Timer 2 Output Enable bit. Used in programmable clock-out mode
only.
0
DCEN
Down Count Enable bit. When set, this allows Timer 2 to be congured
as an up/down counter.
Table 21.
T2CON - Timer/counter 2 control register (address C8H) bit description …continued
Bit
Symbol
Description
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