參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 52/130頁
文件大小: 1200K
代理商: MC68HC05P18A
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Operating Modes
Technical Data
MC68HC05P18A
52
Operating Modes
MOTOROLA
6.4.1 STOP Instruction
The STOP instruction can result in one of two modes of operation,
depending on the mask option.
1.
If the stop conversion to halt mask option is not chosen, the STOP
instruction behaves like a normal STOP instruction in the
M68HC05 Family and places the MCU in stop mode.
2.
If the stop conversion to halt mask option is chosen, the STOP
instruction behaves like a WAIT instruction (with the exception of
a brief delay at startup) and places the MCU in halt mode.
6.4.1.1 Stop Mode
Execution of the STOP instruction without conversion to halt places the
MCU in its lowest power consumption mode. In stop mode, the internal
oscillator is turned off, halting
all
internal processing, including the COP
watchdog timer. The RC oscillator that feeds the electrically erasable
programmable read-only memory (EEPROM) and the A/D converter is
also stopped. Execution of the STOP instruction automatically clears the
I bit in the condition code register so that the IRQ external interrupt is
enabled. All other registers and memory remain unaltered. All
input/output lines remain unchanged.
The MCU can be brought out of the stop mode only by:
An IRQ external interrupt
Port A external interrupt, if selected as a mask option
An externally generated reset
When exiting stop mode, the internal oscillator resumes after a 4064
PH2 clock cycle oscillator stabilization delay.
NOTE:
Execution of the STOP instruction without conversion to halt (via mask
option) causes the oscillator to stop, and therefore disable the COP
watchdog timer. If the COP watchdog timer is to be used, stop mode
should be changed to halt mode by selecting the appropriate mask
option.
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