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68HC705BD7 bảng dữ liệu(PDF) 42 Page - Freescale Semiconductor, Inc

tên linh kiện 68HC705BD7
Giải thích chi tiết về linh kiện  SPECIFICATION REV 2.0 (General Release)
PDF  85 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705BD7 bảng dữ liệu(HTML) 42 Page - Freescale Semiconductor, Inc

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SECTION 6: OPERATING MODES
Page 32
GENERAL RELEASE SPECIFICATION
MC68HC05BD7 Rev. 2.0
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
Y
Y
N
N
N
Y
Y
1.Fetch Reset Vector
or
2.Service Interrupt
a.Stack
b.Set I-Bit
c.Vector to Interrupt Routine
Internal
COP
RESET?
External Oscillator Active,
and Internal
Timer Clock Active
Restart
Internal Processor Clock
Stop Internal Processor Clock,
Clear I-Bit in CCR
External
H/W
Interrupt?
External
RESET?
WAIT
N
Internal
Interrupt?
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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