參數(shù)資料
型號(hào)： TS80C51RA2-LIE
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
文件頁數(shù)： 24/85頁
文件大?。?/td> 762K
代理商： TS80C51RA2-LIE
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
TS80C51RA2-MCB High Performance 8-bit Microcontroller
TS80C51RA2-MCE High Performance 8-bit Microcontroller
TS80C51RA2-MIB High Performance 8-bit Microcontroller
TS80C51RA2-MIE High Performance 8-bit Microcontroller
TS80C51RA2-VCB High Performance 8-bit Microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS80C51RA2-LIEB 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-LIED 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-LIER 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-LIJB 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
TS80C51RA2-LIJD 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontrollers
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