MC68HC08AS20 Datasheet, PDF (164/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

13.3 Functional Description
Figure 13-1 shows the structure of the COP module.
CGMXCLK
SIM
12-BIT SIM COUNTER
SIM RESET CIRCUIT
SIM RESET STATUS REGISTER
STOP INSTRUCTION
INTERNAL RESET SOURCES⁽¹⁾
RESET VECTOR FETCH
COPCTL WRITE
COPEN (FROM SIM)
COPD (FROM MOR)
RESET
COPCTL WRITE
COPL
COP MODULE
6-BIT COP COUNTER
CLEAR
COP COUNTER
NOTE:
1. See 9.4.2 Active Resets from Internal Sources.
Figure 13-1. COP Block Diagram
Table 13-1. COP I/O Register Summary
Addr.
Register Name
Bit 7 6
5
4
3
2
1 Bit 0
$FFFF COP Control Register (COPCTL)
Read:
Write:
Low Byte of Reset Vector
Writing to $FFFF Clears COP Counter
Reset:
Unaffected by Reset
Advance Information
164
MC68HC08AS20 —Rev. 4.1
Freescale Semiconductor