s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 126

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Computer Operating Properly (COP
13.3 I/O Signals
The following paragraphs describe the signals shown in
13.3.1 CGMXCLK
CGMXCLK is the crystal oscillator output signal. CGMXCLK frequency is equal to the crystal frequency.
13.3.2 STOP Instruction
The STOP instruction clears the COP prescaler.
13.3.3 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.
13.3.4 Power-On Reset
The power-on reset (POR) circuit clears the COP prescaler 4096 CGMXCLK cycles after power-up.
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INTERNAL RESET SOURCES
COPRS FROM CONFIG-1
RESET VECTOR FETCH
COPD FROM CONFIG-1
STOP INSTRUCTION
COPCTL WRITE
COPCTL WRITE
CGMXCLK
RESET
Figure 13-1. COP Block Diagram
MC68HC908AZ32A Data Sheet, Rev. 2
12-BIT COP PRESCALER
CLEAR COP
COUNTER
6-BIT COP COUNTER
Figure
13.4 COP Control
13-1.
Register), clears the COP
RESET
RESET STATUS
REGISTER
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