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參數(shù)資料
| 型號(hào)： | T89C51RD2-RLRIM |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 1.40 MM, VQFP-44 |
| 文件頁(yè)數(shù)： | 23/104頁(yè) |
| 文件大?。?/td> | 798K |
| 代理商： | T89C51RD2-RLRIM |
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23
T89C51RD2
4243G
–
8051
–
05/03
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:
Timer 0 overflow
External input on ECI (P1.2)
Oscillator frequency
÷
12 (
÷
6 in X2 mode)
Oscillator frequency
÷
4 (
÷
2 in X2 mode)
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 32).
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 7). The timer
count source is determined from the CPS1 and CPS0 bits in the
CMOD SFR
(See
Table 10) 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 |
|---|---|
| T89C51RD2-RLTCL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLTCM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLTIL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLTIM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLVCL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T89C51RD2-RLRI-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLSC-L | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLSC-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLSI-L | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-RLSI-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
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