s908qc16vdse Freescale Semiconductor, Inc, s908qc16vdse Datasheet - Page 65
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s908qc16vdse
Manufacturer Part Number
s908qc16vdse
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.S908QC16VDSE.pdf
(274 pages)
- Current page: 65 of 274
- Download datasheet (4Mb)
5.3.7 COPRS (COP Rate Select)
The COPRS signal reflects the state of the COP rate select bit (COPRS) in the configuration register 1
(CONFIG1). See
5.4 COP Control Register
The COP control register (COPCTL) 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.
5.5 Interrupts
The COP does not generate CPU interrupt requests.
5.6 Monitor Mode
The COP is disabled in monitor mode when V
5.7 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes.
5.7.1 Wait Mode
The COP continues to operate during wait mode. To prevent a COP reset during wait mode, periodically
clear the COP counter.
5.7.2 Stop Mode
Stop mode turns off the BUSCLKX4 input to the COP and clears the SIM counter. Service the COP
immediately before entering or after exiting stop mode to ensure a full COP timeout period after entering
or exiting stop mode.
5.8 COP Module During Break Mode
The COP is disabled during a break interrupt with monitor mode when BDCOP bit is set in break auxiliary
register (BRKAR).
Freescale Semiconductor
Reset:
Read:
Write:
Chapter 4 Configuration Registers (CONFIG1 and
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 4
Bit 7
Figure 5-2. COP Control Register (COPCTL)
6
5
LOW BYTE OF RESET VECTOR
TST
CLEAR COP COUNTER
Unaffected by reset
is present on the IRQ pin.
4
3
2
CONFIG2).
1
COP Control Register
Bit 0
65
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