參數(shù)資料
型號: C517A
廠商: INFINEON TECHNOLOGIES AG
英文描述: ECONOLINE: RY & RX - Controllable Output- 1kVDC Isolation- No Heatsink Required- UL94V-0 Package Material- Toroidal Magnetics- No External Components- Fully Encapsulated- Efficiency to 70%
中文描述: 8位CMOS單片機
文件頁數(shù): 51/72頁
文件大小: 845K
代理商: C517A
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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