5 cop control register (copctl), 6 interrupts, 7 monitor mode – Freescale Semiconductor MC68HC08KH12 User Manual
Page 211: Cop control register (copctl), Interrupts, Monitor mode, See 13.5 cop, Control register (copctl), Clears the cop counter
MC68HC(7)08KH12
—
Rev. 1.1
Advance Information
Freescale Semiconductor
211
COPRS — COP Rate Select Bit
COPRS selects the COP timeout period. Reset clears COPRS.
1 = COP reset cycle is (2
13
–2
4
)
×
CGMXCLK
0 = COP reset cycle is (2
18
–2
4
)
×
CGMXCLK
COPD — COP Disable Bit
COPD disables the COP module.
1 = COP module disabled
0 = COP module enabled
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.
13.6 Interrupts
The COP does not generate CPU interrupt requests.
13.7 Monitor Mode
The COP is disabled in monitor mode when V
DD
+ V
HI
is present on the
IRQ1/V
PP
pin or on the RST pin.
Address:
$FFFF
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Low byte of reset vector
Write:
Clear COP counter
Reset:
Unaffected by reset
Figure 13-3. COP Control Register (COPCTL)