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Semiconductor Group 5 - 20

On-Chip Peripheral Components

Detailled Description of the Oscillator Watchdog Unit

Figure 5-7 shows the block diagram of the oscillator watchdog unit. It consists of an internal RC

oscillator which provides the reference frequency for the comparison with the frequency of the on-

chip oscillator. The RC oscillator can be enabled/disabled by the control pin OWE . If it is disabled

the complete unit has no function.

Figure 5-7

Oscillator Watchdog Unit

Special Function Register IP0 (Address 0A9H)

Reset value of IP0 is 00

Bit Function

OWDS Oscillator watchdog timer status flag.

Set by hardware when an oscillator watchdog reset occurred. Can be cleared or

set by software.

76543210

MSB LSBBit No.

IP00A9

These bits are not used in controlling the fail safe mechanisms.

OWDS WDTS IP0.5 IP0.4 IP0.3 IP0.2 IP0.1 IP0.0

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Siemens EF 88H Series Bedienungsanleitung Seite 55