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| 型号： | MC68HC05T7B |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| 封装： | SDIP-56 |
| 文件页数： | 89/109页 |
| 文件大小： | 9008K |
| 代理商： | MC68HC05T7B |
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Low-Power Modes
Effects of Stop and Wait Modes
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 3.0
Technical Data
MOTOROLA
Low-Power Modes
79
6.4.3 COP Watchdog
Effects of STOP and WAIT on the COP watchdog are discussed here.
6.4.3.1 STOP
The STOP instruction:
Clears the COP watchdog counter
Disables the COP watchdog clock
NOTE:
To prevent the STOP instruction from disabling the COP watchdog,
program the stop-to-wait conversion bit (SWAIT) in the mask option
register to logic 1.
After exit from stop mode by external interrupt, the COP watchdog
counter immediately begins counting from $0000 and continues
counting throughout the oscillator stabilization delay.
NOTE:
Immediately after exiting stop mode by external interrupt, service the
COP to ensure a full COP timeout period.
After exit from stop mode by reset:
The COP watchdog counter immediately begins counting from
$0000.
The COP watchdog counter is cleared at the end of the oscillator
stabilization delay and begins counting from $0000 again.
6.4.3.2 WAIT
The WAIT instruction has no effect on the COP watchdog.
NOTE:
To prevent a COP timeout during wait mode, exit wait mode periodically
to service the COP.
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