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參數(shù)資料
| 型號： | SAF-C505-LM |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, MQFP-44 |
| 文件頁數(shù)： | 50/85頁 |
| 文件大?。?/td> | 487K |
| 代理商： | SAF-C505-LM |
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C505L
Data Sheet
48
06.99
Oscillator Watchdog
The oscillator watchdog unit serves for four functions:
–
Monitoring of the on-chip oscillator’s function
The watchdog supervises the on-chip oscillator’s frequency; if it is lower than the frequency
of the auxiliary RC oscillator in the watchdog unit, the internal clock is supplied by the RC
oscillator and the device is brought into reset; if the failure condition disappears (i.e. the on-
chip oscillator has a higher frequency than the RC oscillator), the part executes a final reset
phase of typ. 1 ms in order to allow the oscillator to stabilize; then the oscillator watchdog reset
is released and the part starts program execution again.
–
Fast internal reset after power-on
The oscillator watchdog unit provides a clock supply for the reset before the on-chip oscillator
has started. The oscillator watchdog unit also works identically to the monitoring function.
–
Control of wake-up from software power-down mode
When the software power-down mode is left by a low level at the P3.2/INT0 pin or an active
Real-Time Clock Interrupt Request flag IRTC, the oscillator watchdog unit assures that the
microcontroller resumes operation (execution of the power-down wake-up interrupt) with the
nominal clock rate. In the power-down mode the RC oscillator and the on-chip oscillator are
stopped. Both oscillators are started again when power-down mode is released. When the on-
chip oscillator has a higher frequency than the RC oscillator, the microcontroller starts
operation after a final delay of typ. 1 ms in order to allow the on-chip oscillator to stabilize.
Note: The oscillator watchdog unit is always enabled.
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