mc68hc908ap8cfa Freescale Semiconductor, Inc, mc68hc908ap8cfa Datasheet - Page 287

• Manufacturer Part Number: mc68hc908ap8cfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

19.3.8 COPRS (COP Rate Select)
The COPRS signal reflects the state of the COP rate select bit (COPRS) in the CONFIG1 register.
COPRS — COP Rate Select Bit
COPD — COP Disable Bit
19.4 COP Control Register
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.
19.5 Interrupts
The COP does not generate CPU interrupt requests.
19.6 Monitor Mode
When monitor mode is entered with V
on the IRQ1 pin or the RST pin. When monitor mode is entered by having blank reset vectors and not
having V
19.7 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes.
Freescale Semiconductor
COPRS selects the COP time out period. Reset clears COPRS.
COPD disables the COP module.
1 = COP time out period = 2
0 = COP time out period = 2
1 = COP module disabled
0 = COP module enabled
TST
on the IRQ1 pin, the COP is automatically disabled until a POR occurs.
Address:
Address:
Reset:
Reset:
Read:
Write:
Read:
Write:
COPRS
$001F
$FFFF
Bit 7
Bit 7
0
Figure 19-2. Configuration Register 1 (CONFIG1)
Figure 19-3. COP Control Register (COPCTL)
LVISTOP
6
0
6
MC68HC908AP Family Data Sheet, Rev. 4
13
18
– 2
– 2
TST
LVIRSTD
4
4
on the IRQ1 pin, the COP is disabled as long as V
ICLK cycles
ICLK cycles
5
0
5
LVIPWRD
Low byte of reset vector
Unaffected by reset
Clear COP counter
4
0
4
LVIREGD
3
0
3
SSREC
2
0
2
STOP
1
0
1
COP Control Register
COPD
Bit 0
Bit 0
0
TST
remains
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