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| 型號： | SAB83C517A-5N18-T4 |
| 文件頁數(shù)： | 58/77頁 |
| 文件大?。?/td> | 1358K |
| 代理商： | SAB83C517A-5N18-T4 |
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SAB 80C517A/83C517A-5
Semiconductor Group
57
1994-05-01
Watchdog Units
The SAB 80C517A offers two enhanced fail safe mechanisms, which allow an automatic
recovery from hardware failure or software upset:
– programmable watchdog timer (WDT), variable from 512
μ
s up to appr. 1.1 s time-out
period @12 MHz. Upward compatible to SAB 80515 watchdog.
– oscillator watchdog (OWD), monitors the on-chip oscillator and forces the micro-
controller into reset state, in case the on-chip oscillator fails, controls the restart from
the Hardware Power Down Mode and provides clock for a fast internal reset after power-on.
Programmable Watchdog Timer
The WDT can be activated by hardware or software.
Hardware initialization is done when pin PE/SWD (Pin 4) is held high during RESET. The
SAB 80C517A then starts program execution with the WDT running. Since Pin PE/SWD is
only sampled during Reset (and hardware power down at parts with stepping code AD and
later) dynamical switching of the WDT is not possible.
Software initialization is done by setting bit SWDT.
A refresh of the watchdog timer is done by setting bits WDT and SWDT consecutively.
A block diagram of the watchdog timer is shown in figure 11.
When a watchdog timer resest occurs, the watchdog timer keeps on running, but a status flag
WDTS is set. This flag can also be cleared by software.
Figure 11
Block Diagram of the Programmable Watchdog Timer
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAB83C517A-N18-T4 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Single-Chip Microcontroller |
| SAB88C166 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit CMOS Single-Chip Microcontrollers with/without oscillator prescaler with 32 KByte Flash EPROM |
| SAB88C166-5M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit CMOS Single-Chip Microcontrollers with/without oscillator prescaler with 32 KByte Flash EPROM |
| SAB88C166EVAL | 制造商:Siemens 功能描述: |
| SAB88C166W-5M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit CMOS Single-Chip Microcontrollers with/without oscillator prescaler with 32 KByte Flash EPROM |
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