參數(shù)資料
型號(hào)： TS80C51RD2-MCLB
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 40 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁(yè)數(shù)： 16/74頁(yè)
文件大?。?/td> 689K
代理商： TS80C51RD2-MCLB
Rev. C - 06 March, 2001
23
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
6.5. 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 7). The timer count source is
determined from the CPS1 and CPS0 bits in the CMOD SFR (See Table 8) 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
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