參數(shù)資料
型號(hào)： MC68HC05C9AP
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 103/160頁
文件大?。?/td> 4128K
代理商： MC68HC05C9AP
Resets
Computer Operating Properly (COP) Reset
MC68HC05C9A — Rev. 4.0
General Release Specification
Resets
NON-DISCLOSURE
AGREEMENT
REQUIRED
5.5.1 COP Reset Register
This write-only register, shown in Figure 5-4, is used to reset the COP.
The sequence required to reset the COP timer is as follows:
Write $55 to the COP reset register
Write $AA to the COP reset register
Both write operations must occur in the order listed, but any number of
instructions may be executed between the two write operations provided
that the COP does not time out between the two writes. The elapsed
time between software resets must not be greater than the COP timeout
period. If the COP should time out, a system reset will occur and the
device will be re-initialized in the same fashion as a power-on reset or
reset.
Reading this register does not return valid data.
$001D
Bit 7
6543
2
1
Bit 0
Read:
Write:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset:
00000
0
= Unimplemented
Figure 5-4. COP Reset Register (COPRST)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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