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參數資料
| 型號： | SAF-C517A-L |
| 廠商： | SIEMENS AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8 BIT CMOS MICROCONTROLLER |
| 中文描述： | 8位CMOS單片機 |
| 文件頁數： | 51/72頁 |
| 文件大?。?/td> | 845K |
| 代理商： | SAF-C517A-L |
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Semiconductor Group
49
C517A
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.
–
Restart from the hardware power down mode.
If the hardware power down mode is terminated the oscillator watchdog has to control the
correct start-up of the on-chip oscillator and to restart the program. The oscillator watchdog
function is only part of the complete hardware power down sequence; however, the watchdog
works identically to the monitoring function.
Figure 25
Block Diagram of the Oscillator Watchdog
OWDS
1
IP0 (A9H
Frequency
Comparator
Delay
f
2
<
1
f
f
1
2
f
Internal Clock
On-Chip
Oscillator
Oscillator
RC
XTAL1
XTAL2
RC
f
3MHz
MCB03337
÷ 5
÷ 2
_
Internal Reset
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