MC68HC705MC4MP datasheet(143/180 Pages) FREESCALE

부품명	MC68HC705MC4MP

상세설명	General Release Specification

PDF	180 Pages

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Core Timer

Computer Operating Properly (COP) Watchdog Reset

General Release Specification

Core Timer

12.4 Computer Operating Properly (COP) Watchdog Reset

The COP watchdog timer function is implemented on this device by

using the output of the RTI circuit and further dividing it by eight. The

minimum COP reset rates are listed in Table 12-2. If the COP circuit

times out, an internal reset is generated and the normal reset vector is

fetched. Preventing a COP timeout is done by writing a 0 to bit 0 of

address $0FF0. When the COP is cleared, only the final divide-by-eight

stage (output of the RTI) is cleared. This function is a mask option.

Table 12-2. Minimum COP Reset Times

RT1:RT0

Minimum COP Reset at Bus Frequency:

16.384 kHz

3.0 MHz

fop

7 sec

38.2 ms

× (RTI Rate)

14 sec

76.5 ms

× (RTI Rate)

28 sec

153.0 ms

× (RTI Rate)

56 sec

305.9 ms

× (RTI Rate)

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MC68HC705MC4MP 데이터시트(PDF) 143 Page - Freescale Semiconductor, Inc