參數(shù)資料
型號(hào)： SAB-C517A-4R24M
廠(chǎng)商： SIEMENS A G
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-Bit CMOS Microcontroller
中文描述： 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP100
文件頁(yè)數(shù)： 48/67頁(yè)
文件大?。?/td> 479K
代理商： SAB-C517A-4R24M
C517A
Semiconductor Group
48
1997-10-01
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 24
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
相關(guān)PDF資料
PDF描述
SAF-C517A-4R24M 8-Bit CMOS Microcontroller
SAB-C517A 8-bit CMOS MICROCONTROLLER
SAF-C517A-LN 8-bit CMOS MICROCONTROLLER
SAH-C517A 8-bit CMOS MICROCONTROLLER
SAF-C517A 8-bit CMOS MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAB-C517A-4RM 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAB-C517A-L24M 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SAB-C517A-LM 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SABC517ALN 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
SABC517A-LN 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8 BIT CMOS MICROCONTROLLER
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