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| 型號(hào)： | MC68HC08GP8ACFB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 6/126頁(yè) |
| 文件大?。?/td> | 4243K |
| 代理商： | MC68HC08GP8ACFB |
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Low-Power Modes
Computer Operating Properly Module (COP)
MC68HC08GP8A
Data Sheet
MOTOROLA
Low-Power Modes
103
9.5.2 Stop Mode
If the OSCSTOPEN bit in the MOR register is cleared (default), then the STOP
instruction disables the CGM (oscillator and phase-locked loop) and holds low all
CGM outputs (CGMXCLK, CGMOUT, and CGMINT).
If the STOP instruction is executed with the VCO clock, CGMVCLK, divided by two
driving CGMOUT, the PLL automatically clears the BCS bit in the PLL control
register (PCTL), thereby selecting the crystal clock, CGMXCLK, divided by two as
the source of CGMOUT. When the MCU recovers from STOP, the crystal clock
divided by two drives CGMOUT and BCS remains clear.
If the OSCSTOPEN bit in the MOR register is set, then the phase locked loop is
shut off but the oscillator will continue to operate in stop mode.
9.6 Computer Operating Properly Module (COP)
9.6.1 Wait Mode
The COP remains active during wait mode. If COP is enabled, a reset will occur at
COP timeout.
9.6.2 Stop Mode
Stop mode turns off the CGMXCLK input to the COP and clears the COP prescaler.
Service the COP immediately before entering or after exiting stop mode to ensure
a full COP timeout period after entering or exiting stop mode.
The STOP bit in the MOR register enables the STOP instruction. To prevent
inadvertently turning off the COP with a STOP instruction, disable the STOP
instruction by clearing the STOP bit.
9.7 External Interrupt Module (IRQ)
9.7.1 Wait Mode
The IRQ module remains active in wait mode. Clearing the IMASK bit in the IRQ
status and control register enables IRQ CPU interrupt requests to bring the MCU
out of wait mode.
9.7.2 Stop Mode
The IRQ module remains active in stop mode. Clearing the IMASK bit in the IRQ
status and control register enables IRQ CPU interrupt requests to bring the MCU
out of stop mode.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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