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| 型號(hào)： | MC68HC05E5DW |
| 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, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁(yè)數(shù)： | 105/140頁(yè) |
| 文件大小： | 847K |
| 代理商： | MC68HC05E5DW |
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Computer Operating Properly (COP) Watchdog
System Control and Status Register
MC68HC05E5 — Rev. 1.0
General Release Specification
MOTOROLA
Computer Operating Properly (COP) Watchdog
67
NON-DISCLOSURE
AGREEMENT
REQUIRED
COPR — COP Reset
COPR is a read-only status bit. This bit is set by a COP reset, but is
cleared by POR, external reset, or illegal address reset.
1 = Last reset was a COP reset.
0 = Last reset was not a COP reset.
NOTE:
The COP watchdog reset is a mask option. Therefore, a COP reset will
only occur when this option is enabled. This option cannot be disabled
by software.
CRS1 and CRS0 — COP Rate Select
The value of these two bits determines the COP timeout rate. These
bits can be written only on the first write to this register after reset. If
these bits are never written to, the COP reset rate will be set at one
second. The COP counter chain is cleared when these bits are
written.
NOTE:
Although these bits default to zero, the user should write to these bits to
prevent subsequent writes from changing the COP rate.
A bit set/clear for any bit in this register is executed as a
read-modify-write of this register. If used as the first write to this register,
further writes to CRS1 and CRS0 would not be valid, and the default
value would be set.
Table 10-1. COP Rates at fosc = 32.768 kHz
CRS1
CRS0
Minimum COP Rate
0
1 second
0
1
2 seconds
1
0
4 seconds
1
8 seconds
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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