MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 164

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Computer Operating Properly (COP)
15.3.1 CGMXCLK
CGMXCLK is the crystal oscillator output signal. CGMXCLK frequency is equal to the crystal frequency.
15.3.2 STOP Instruction
The STOP instruction clears the COP prescaler.
15.3.3 COPCTL Write
Writing any value to the COP control register (COPCTL) (see
counter and clears stages 12 through 4 of the COP prescaler. Reading the COP control register returns
the reset vector.
15.3.4 Power-On Reset
The power-on reset (POR) circuit clears the COP prescaler 4096 CGMXCLK cycles after power-up.
15.3.5 Internal Reset
An internal reset clears the COP prescaler and the COP counter.
164
INTERNAL RESET SOURCES
RESET VECTOR FETCH
COPD FROM CONFIG-1
COPL FROM CONFIG-1
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
STOP INSTRUCTION
COPCTL WRITE
COPCTL WRITE
CGMXCLK
RESET
Figure 15-1. COP Block Diagram
12-BIT COP PRESCALER
CLEAR COP
COUNTER
6-BIT COP COUNTER
15.4 COP Control
Register), clears the COP
RESET
RESET STATUS
REGISTER
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