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Computer Operating Properly Module (COP)
Technical Data
MC68HC908KX8 MC68HC908KX2 MC68HC08KX8 — Rev. 1.0
162
Computer Operating Properly Module (COP)
MOTOROLA
11.5.2 STOP Instruction
The STOP instruction clears the COP prescaler.
11.5.3 COPCTL Write
Writing any value to the COP control register (COPCTL) clears the COP
counter and clears stages 12–5 of the COP prescaler. Reading the COP
control register returns the low byte of the reset vector.
11.5.4 Power-On Reset
The power-on reset (POR) circuit clears the COP prescaler 4096
CGMXCLK cycles after power-up.
11.5.5 Internal Reset
An internal reset clears the COP prescaler and the COP counter.
11.5.6 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.
11.5.7 COPD (COP Disable)
The COPD signal reflects the state of the COP disable bit (COPD) in the
11.5.8 COPRS (COP Rate Select)
The COPRS signal reflects the state of the COP rate select bit (COPRS)