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參數(shù)資料
| 型號(hào)： | SST89V54RD2A-33-C-TQJE |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | ROHS COMPLIANT, MS-026, TQFP-44 |
| 文件頁數(shù)： | 52/83頁 |
| 文件大?。?/td> | 1746K |
| 代理商： | SST89V54RD2A-33-C-TQJE |
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56
Data Sheet
FlashFlex51 MCU
SST89E54RD2A/RDA / SST89E58RD2A/RDA
SST89V54RD2A/RDA / SST89V58RD2A/RDA
2006 Silicon Storage Technology, Inc.
S71339-00-000
12/06
8.3.5 Watchdog Timer
The Watchdog Timer mode is used to improve reliability in
the system without increasing chip count (See Figure 8-6).
Watchdog Timers are useful for systems that are suscepti-
ble to noise, power glitches, or electrostatic discharge. It
can also be used to prevent a software deadlock. If during
the execution of the user’s code, there is a deadlock, the
Watchdog Timer will time out and an internal reset will
occur. Only module 4 can be programmed as a Watchdog
Timer (but still can be programmed to other modes if the
Watchdog Timer is not used).
To use the Watchdog Timer, the user pre-loads a 16-bit
value in the compare register. 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 timer by clearing the WDTE
bit before a match occurs and then re-enable it.
The first two options are more reliable because the Watch-
dog 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 rec-
ommended if other PCA modules are being used. Remem-
ber, 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 application the first solution is the
best option.
Use the code below to initialize the Watchdog Timer. Mod-
ule 4 can be configured in either compare mode, and the
WDTE bit in CMOD must also be set. The user’s software
then must periodically change (CCAP4H, CCAP4L) to
keep a match from occurring with the PCA timer (CH, CL).
This code is given in the Watchdog routine below.
;==============================================
Init_Watchdog:
MOVCCAPM4, #4CH; Module 4 in compare mode
MOVCCAP4L, #0FFH; Write to low byte first
MOVCCAP4H, #0FFH; Before PCA timer counts up
; to FFFF Hex, these compare
; values must be changed.
ORLCMOD, #40H; Set the WDTE bit to enable the
; watchdog timer without
; changing the other bits in
; CMOD
;==============================================
;Main program goes here, but call WATCHDOG periodically.
;==============================================
WATCHDOG:
CLR EA; Hold off interrupts
MOVCCAP4L, #00; Next compare value is within
MOVCCAP4H, CH; 65,535 counts of the
; current PCA
SETBEA; timer value
RET
;==============================================
This routine should not be part of an interrupt service rou-
tine. If the program counter goes astray and gets stuck in an
infinite loop, interrupts will still be serviced and the watchdog
will keep getting reset. Thus, the purpose of the watchdog
would be defeated. Instead, call this subroutine from the
main program of the PCA timer.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SST89V54RD2RD | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89V54RD2-RD | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89V54RD-33-C-PI | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU |
| SST89V54RD-33-C-PIE | 功能描述:8位微控制器 -MCU 24KB+1KB 33MHz 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| SST89V54RD-33-C-QIF | 功能描述:8位微控制器 -MCU 8-Bit 16K+8K Flash 33MHz 3/16-Bit Timer 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
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