參數(shù)資料
型號: 68HC705BD7
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): 42/85頁
文件大?。?/td> 302K
代理商: 68HC705BD7
MOTOROLA
Page 32
SECTION 6: OPERATING MODES
GENERAL RELEASE SPECIFICATION
MC68HC05BD7 Rev. 2.0
PRELMNARY
Internal Processor Clock
6.7
COP Watchdog Timer Considerations
The COP Watchdog Timer is always enable in MC68HC05BD7. 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 6-2: WAIT Flowcharts
1.Fetch Reset Vector
or
2.Service Interrupt
a.Stack
b.Set I-Bit
c.Vector to Interrupt Routine
Internal
COP
RESET
and Internal
Timer Clock Active
Stop Internal Processor Clock,
Clear I-Bit in CCR
External
H/W
Interrupt
External
RESET
WAIT
Internal
Interrupt
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