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參數(shù)資料
| 型號(hào)： | AT80C51RA2 |
| 廠商： | International Rectifier |
| 英文描述： | High Performance 8-bit Microcontroller |
| 中文描述： | 高性能8位微控制器 |
| 文件頁(yè)數(shù)： | 24/85頁(yè) |
| 文件大?。?/td> | 762K |
| 代理商： | AT80C51RA2 |
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24
4188E–8051–08/06
AT/TS8xC51Rx2
6.3
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 accuracy. 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:
Oscillator frequency
÷
12 (
÷
6 in X2 mode)
Oscillator frequency
÷
4 (
÷
2 in X2 mode)
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, or
pulse width modulator.
Module 4 can also be programmed as a watchdog timer (See Section "PCA Watchdog Timer",
page 33).
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 executes 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 the port is not used for the PCA, it can still be used for standard I/O.
The PCA timer
is a common time base for all five modules (See Figure 6-4). The timer count
source is determined from the CPS1 and CPS0 bits in the
CMOD SFR
(See Table 6-4) and can
be programmed to run at:
1/12 the oscillator frequency. (Or 1/6 in X2 Mode)
1/4 the oscillator frequency. (Or 1/2 in X2 Mode)
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
16-bit Module 4
P1.7 / CEX4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT80C51RA2-3CSCL | High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSCV | High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSIM | High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSIV | High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSUL | High Performance 8-bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT80C51RA2-3CSCL | 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSCV | 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSIM | 制造商:IRF 制造商全稱(chēng):International Rectifier 功能描述:High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSIV | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:High Performance 8-bit Microcontroller |
| AT80C51RA2-3CSUL | 功能描述:8位微控制器 -MCU MICRO RLESS RA 40MHZ 3V COM TEMP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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