參數(shù)資料
型號: MC68HC05BD5
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 88/112頁
文件大小: 676K
代理商: MC68HC05BD5
MOTOROLA
10-2
MC68HC05BD3
LOW POWER MODES
10
10.3
COP Watchdog Timer Considerations
The COP watchdog timer is always enabled in MC68HC05BD3. It will reset the MCU when it times
out. For a system that must have intentional uses of the WAIT Mode, care must be taken to prevent
such situations from happening during normal operations by arranging timely interrupts to reset
the COP watchdog timer.
Figure 10-1
WAIT Flowchart
Y
External
reset
N
WAIT
External oscillator active
and
Internal Timer Clock Active
Stop internal processor clock,
Clear I bit in CCR
Internal COP
reset
External H/W
reset
Internal
interrupt
Restart internal
processor clock
1. Fetch reset vector
or
2. Service interrupt
a. Stack
b. Set I bit
c. Vector to interrupt routine
N
N
N
Y
Y
Y
TPG
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