參數(shù)資料
型號: MC68HC705C9ACP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Microcontrollers
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 60/160頁
文件大?。?/td> 2076K
代理商: MC68HC705C9ACP
Resets
Advance Information
MC68HC705C9A — Rev. 4.0
60
Resets
MOTOROLA
5.5 Computer Operating Properly (COP) Reset
This device includes a watchdog COP feature which guards against
program run-away failures. A timeout of the computer operating properly
(COP) timer generates a COP reset. The COP watchdog is a software
error detection system that automatically times out and resets the MCU
if not cleared periodically by a program sequence.
This device includes two COP types, one for C12A compatibility and the
other for C9A compatibility. When configured as a C9A the COP can be
enabled by user software by setting COPE in the C9A COP control
register (C9ACOPCR). When configured as a C12A, the COP is enabled
prior to operation by programming the C12COPE bit in the C12A mask
option register (C12MOR). The function and control of both COPs is
detailed below.
5.6 MC68HC05C9A Compatible COP
This COP is controlled with two registers; one to reset the COP timer and
the other to enable and control COP and clock monitor functions.
Figure 5-3
shows a block diagram of the MC68HC05C9A COP.
Figure 5-3. C9A COP Block Diagram
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13
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15
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17
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19
2
21
COPRST
CM0
CM1
16 BIT TIMER SYSTEM
INTERNAL
CPU
CLOCK
COP
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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