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参数资料
型号： MC68HC705P9MDW
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装： SOIC-28
文件页数： 157/160页
文件大小： 2208K
代理商： MC68HC705P9MDW
Computer Operating Properly Watchdog (COP)
Technical Data
MC68HC705P9 — Rev. 4.0
96
Computer Operating Properly Watchdog (COP)
MOTOROLA
8.3 Introduction
The purpose of the computer operating properly (COP) watchdog is to
reset the MCU in case of software failure. Software that is operating
properly periodically services the COP watchdog and prevents the reset
from occurring. The COP watchdog function is programmable in the
mask option register.
8.4 Operation
8.4.1 COP Watchdog Timeout
The COP watchdog is a 16-bit counter that generates a reset if allowed
to time out. Periodically clearing the counter starts a new timeout period
and prevents the COP from resetting the MCU. A COP watchdog
timeout indicates that the software is not executing instructions in the
correct sequence.
NOTE:
The internal clock drives the COP watchdog. Therefore, the COP
watchdog cannot generate a reset for errors that cause the internal clock
to stop.
The COP watchdog also depends on a power supply voltage at or above
a minimum specification and is not guaranteed to protect against
brownout. For information about brownout protection, see Section 5.
Resets and Interrupts.
8.4.2 COP Watchdog Timeout Period
Use the following formula to calculate the COP timeout period:
where
COP timeout period
131 072 cycles
,
fBUS
---------------------------------------
=
fBUS
crystal frequency
2
---------------------------------------------
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相关PDF资料
PDF描述
MC68HC705P9S 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
MC68HC705P9VS 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
MC908QT1ACFQ 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, DSO8
MC908QT2AVDWE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
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