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M68ICS08GR bảng dữ liệu(PDF) 136 Page - Freescale Semiconductor, Inc

tên linh kiện M68ICS08GR
Giải thích chi tiết về linh kiện  M68HC08 Microcontrollers
PDF  408 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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M68ICS08GR bảng dữ liệu(HTML) 136 Page - Freescale Semiconductor, Inc

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Computer Operating Properly (COP)
Technical Data
MC68HC908GR8 — Rev 4.0
136
Computer Operating Properly (COP)
MOTOROLA
9.4.6 Reset Vector Fetch
A reset vector fetch occurs when the vector address appears on the data
bus. A reset vector fetch clears the COP prescaler.
9.4.7 COPD (COP Disable)
The COPD signal reflects the state of the COP disable bit (COPD) in the
configuration register. See Configuration Register (CONFIG).
9.4.8 COPRS (COP Rate Select)
The COPRS signal reflects the state of the COP rate select bit (COPRS)
in the configuration register. See Configuration Register (CONFIG).
9.5 COP Control Register
The COP control register is located at address $FFFF and overlaps the
reset vector. Writing any value to $FFFF clears the COP counter and
starts a new timeout period. Reading location $FFFF returns the low
byte of the reset vector.
9.6 Interrupts
The COP does not generate CPU interrupt requests.
Address: $FFFF
Bit 7
6
54321
Bit 0
Read:
Low byte of reset vector
Write:
Clear COP counter
Reset:
Unaffected by reset
Figure 9-2. COP Control Register (COPCTL)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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