参数资料
型号: AT89C51RB2-SLSUM
厂商: Atmel
文件页数: 53/127页
文件大小: 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 972
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: 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: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
31
AT89C51RB2/RC2
4180E–8051–10/06
Programmable
Counter Array (PCA)
The PCA provides more timing capabilities with less CPU intervention than the standard
timer/counters. Its advantages include reduced software overhead and improved accu-
racy. The PCA consists of a dedicated timer/counter which serves as the time base for
an array of five compare/capture Modules. Its clock input can be programmed to count
any one of the following signals:
Peripheral clock frequency (F
CLK PERIPH)
÷ 6
Peripheral clock frequency (FCLK PERIPH)
÷ 2
Timer 0 overflow
External input on ECI (P1.2)
Each compare/capture Modules can be programmed in any one of the following modes:
Rising and/or falling edge capture
Software timer
High-speed output
Pulse width modulator
Module 4 can also be programmed as a watchdog timer (see Section "PCA Watchdog
When the compare/capture Modules are programmed in the capture mode, software
timer, or high speed output mode, an interrupt can be generated when the Module exe-
cutes its function. All five Modules plus the PCA timer overflow share one interrupt
vector.
The PCA timer/counter and compare/capture modules share Port 1 for external I/O.
These pins are listed below. If one or several bits in the port are not used for the PCA,
they can still be used for standard I/O.
The PCA timer is a common time base for all five Modules (see Figure 11). The timer
count source is determined from the CPS1 and CPS0 bits in the CMOD register
(Table 22) and can be programmed to run at:
1/6 the
peripheral clock frequency (F
CLK PERIPH)
1/2 the
peripheral clock frequency (FCLK PERIPH)
The Timer 0 overflow
The input on the ECI pin (P1.2)
PCA Component
External I/O Pin
16-bit Counter
P1.2/ECI
16-bit Module 0
P1.3/CEX0
16-bit Module 1
P1.4/CEX1
16-bit Module 2
P1.5/CEX2
16-bit Module 3
P1.6/CEX3
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