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參數(shù)資料
| 型號： | AT80C51RA2-3CSUL |
| 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)： | 33/85頁 |
| 文件大?。?/td> | 762K |
| 代理商： | AT80C51RA2-3CSUL |
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33
4188E–8051–08/06
AT/TS8xC51Rx2
Figure 6-9.
PCA PWM Mode
6.3.5
PCA Watchdog Timer
An on-board watchdog timer is available with the PCA to improve the reliability of the system
without increasing chip count. Watchdog timers are useful for systems that are susceptible to
noise, power glitches, or electrostatic discharge. Module 4 is the only PCA module that can be
programmed as a watchdog. However, this module can still be used for other modes if the
watchdog is not needed. Figure 6-7 shows a diagram of how the watchdog works. The user pre-
loads a 16-bit value in the compare registers. Just like the other compare modes, this 16-bit
value is compared to the PCA timer value. If a match is allowed to occur, an internal reset will be
generated. This will not cause the RST pin to be driven high.
In order to hold off the reset, the user has three options:
1. Periodically change the compare value so it will never match the PCA timer,
2. periodically change the PCA timer value so it will never match the compare values, or
3. Disable the watchdog by clearing the WDTE bit before a match occurs and then re-enable
it.
The first two options are more reliable because the watchdog timer is never disabled as in option
#3. If the program counter ever goes astray, a match will eventually occur and cause an internal
reset. The second option is also not recommended if other PCA modules are being used.
Remember, the PCA timer is the time base for all modules; changing the time base for other
modules would not be a good idea. Thus, in most applications the first solution is the best option.
This watchdog timer won’t generate a reset out on the reset pin.
CL
CCAPnH
CCAPnL
ECOMn
CCAPMn, n= 0 to 4
0xDA to 0xDE
CAPNn MATn TOGn PWMn ECCFn
CAPPn
8 bit comparator
CEXn
“0”
“1”
<
Enable
PCA counter/timer
Overflow
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT80C51RA2-3CSUM | High Performance 8-bit Microcontroller |
| AT80C51RA2-RLSIV | High Performance 8-bit Microcontroller |
| AT80C51RA2-RLTCL | High Performance 8-bit Microcontroller |
| AT80C51RA2-RLTCV | High Performance 8-bit Microcontroller |
| AT80C51RA2-RLTIM | High Performance 8-bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT80C51RA2-3CSUM | 功能描述:8位微控制器 -MCU MICRO RLESS RA 40MHZ 5V 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| AT80C51RA2-RLRUL | 功能描述:8位微控制器 -MCU 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| AT80C51RA2-RLSIV | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontroller |
| AT80C51RA2-RLTCL | 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller |
| AT80C51RA2-RLTCV | 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller |
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