参数资料
型号: P89CV51RB2FA,512
厂商: NXP Semiconductors
文件页数: 24/76页
文件大小: 0K
描述: IC 80C51 MCU FLASH 16K 44-PLCC
产品培训模块: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
标准包装: 1,300
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: EBI/EMI,SPI,UART/USART
外围设备: 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: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
产品目录页面: 706 (CN2011-ZH PDF)
其它名称: 568-4252-5
935284111512
P89CV51RB2FA
P89CV51RB2_RC2_RD2_3
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 25 August 2009
30 of 76
NXP Semiconductors
P89CV51RB2/RC2/RD2
80C51 with 1 kB RAM, SPI
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 18 using T2CON (Table 19 and Table 20)
and T2MOD (Table 21 and Table 22).
Fig 10. 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 18.
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 19.
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 20.
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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