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C515C Datasheet

  • C515C

  • 8-Bit CMOS Microcontroller

  • 1124.47KB

  • Infineon   Infineon

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C515C
Oscillator Watchdog
The oscillator watchdog unit serves for four functions:
鈥?/div>
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.
鈥?/div>
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.
鈥?/div>
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.
鈥?/div>
Control of external 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, 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.
Semiconductor Group
51
1997-07-01

C515C PDF文件相關(guān)型號(hào)

SAB-C515C-8RM,SAB-C515C-LM,SAF-C515C-8RM,SAF-C515C-LM

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