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MC68HC08AZ60A Datasheet, PDF (193/480 Pages) Motorola, Inc – Microcontrollers
Computer Operating Properly (COP)
COP Control Register (COPCTL)
13.5 COP Control Register (COPCTL)
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.
Bit 7
6
5
4
3
2
1
Bit 0
COPCTL Read:
$FFFF Write:
Low byte of reset vector
Clear COP counter
Reset:
Unaffected by reset
Figure 13-2. COP Control Register (COPCTL)
13.6 Interrupts
The COP does not generate CPU interrupt requests.
13.7 Monitor Mode
The COP is disabled in monitor mode when VHI is present on the IRQ pin
or on the RST pin.
13.8 Low-Power Modes
The WAIT and STOP instructions put the MCU in low-power-
consumption standby modes.
13.8.1 WAIT Mode
The COP continues to operate during WAIT mode. To prevent a COP
reset during WAIT mode, the COP counter should be cleared
periodically in a CPU interrupt routine.
MC68HC08AZ60A — Rev 0.0
MOTOROLA
Computer Operating Properly (COP)
Advance Information
193