參數(shù)資料
型號(hào)： AT80C51RD2-SLSUM
廠商： Atmel
文件頁數(shù)： 15/81頁
文件大?。?/td> 0K
描述： IC 8051 MCU 5V SPI 20MHZ 44-PLCC
標(biāo)準(zhǔn)包裝： 972
系列： 80C
核心處理器： 8051
芯體尺寸： 8-位
速度： 40MHz
連通性： UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器類型： ROMless
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-PLCC
包裝： 管件
22
4113D–8051–01/09
AT80C51RD2
10. 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:
Peripheral clock frequency (F
CLK PERIPH) ÷ 6
Peripheral clock frequency (F
CLK 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 Timer",
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 10-1). The timer count
source is determined from the CPS1 and CPS0 bits in the CMOD register (Table 10-1) 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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