MC68HC08XL36 Datasheet, PDF (296/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

COP
Freescale Semiconductor, Inc.
Power-On Reset
The power-on reset (POR) circuit clears the COP prescaler 4096
CGMXCLK cycles after power-up.
Internal Reset
An internal reset clears the COP prescaler and the COP counter.
Reset Vector Fetch A reset vector fetch occurs when the vector address appears on the data
bus. A reset vector fetch clears the COP prescaler.
COP Control Register
The COP control register is located at address $FFFF and overlaps the
reset vector. Writing any value to $FFFF clears the COP counter and
starts a new timeout period. Reading location $FFFF returns the low
byte of the reset vector.
Address: $FFFF
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Low byte of reset vector
Write:
Clear COP counter
Reset:
Unaffected by Reset
Figure 2. COP Control Register (COPCTL)
MC68HC08XL36
296
Computer Operating Properly Module (COP)
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4-copopt2_b
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