SAF-C505C-2RM View Datasheet(PDF) - Infineon Technologies

Part Name

Description

Manufacturer

SAF-C505C-2RM

8-bit Single-Chip Microcontroller

Infineon Technologies 

C505 / C505C

C505A / C505CA

Oscillator Watchdog

The oscillator watchdog unit serves for three 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, in order to allow the

oscillator to stabilize, executes a final reset phase of typ. 1 ms; then the oscillator watchdog

reset is released and the part starts program execution from address 0000H 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 external wake-up from software power-down mode

When the power-down mode is left by a low level at the P3.2/INT0 pin or the P4.1/RXDC 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 program execution by processing a power down

interrupt after a final delay of typ. 1 ms in order to allow the on-chip oscillator to stabilize.

Data Sheet

47

08.00

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