参数资料
型号: P89V51RD2FN,112
厂商: NXP Semiconductors
文件页数: 24/80页
文件大小: 0K
描述: IC 80C51 MCU FLASH 64K 40-DIP
产品培训模块: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
标准包装: 9
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: 64KB(64K 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: 40-DIP(0.600",15.24mm)
包装: 管件
产品目录页面: 706 (CN2011-ZH PDF)
配用: 622-1017-ND - BOARD 44-ZIF PLCC SOCKET
622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP
其它名称: 568-2431-5
935277948112
P89V51RD2FN
P89V51RB2_RC2_RD2_5
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 November 2009
30 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
6.4.3 Mode 2
Mode 2 congures the Timer register as an 8-bit Counter (TLn) with automatic reload, as
shown in Figure 10. Overow from TLn not only sets TFn, but also reloads TLn with the
contents of THn, which must be preset by software. The reload leaves THn unchanged.
Mode 2 operation is the same for Timer 0 and Timer 1.
6.4.4 Mode 3
When timer 1 is in mode 3 it is stopped (holds its count). The effect is the same as setting
TR1=0.
Timer 0 in mode 3 establishes TL0 and TH0 as two separate 8-bit counters. The logic for
mode 3 and Timer 0 is shown in Figure 11. TL0 uses the Timer 0 control bits: T0C/T,
T0GATE, TR0, INT0, and TF0. TH0 is locked into a timer function (counting machine
cycles) and takes over the use of TR1 and TF1 from Timer 1. Thus, TH0 now controls the
‘Timer 1’ interrupt.
Mode 3 is provided for applications that require an extra 8-bit timer. With Timer 0 in
mode 3, the P89V51RB2/RC2/RD2 can look like it has an additional Timer.
Note: When Timer 0 is in mode 3, Timer 1 can be turned on and off by switching it into
and out of its own mode 3. It can still be used by the serial port as a baud rate generator,
or in any application not requiring an interrupt.
Fig 9.
Timer/counter 0 or 1 in mode 1 (16-bit counter)
002aaa520
osc/6
Tn pin
TRn
TnGate
INTn pin
C/T = 0
C/T = 1
TLn
(8-bits)
THn
(8-bits)
TFn
control
overflow
interrupt
Fig 10. Timer/counter 0 or 1 in mode 2 (8-bit auto-reload)
002aaa521
osc/6
Tn pin
TRn
TnGate
INTn pin
TLn
(8-bits)
THn
(8-bits)
TFn
control
overflow
reload
interrupt
C/T = 0
C/T = 1
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