參數(shù)資料
型號： MC68HC705P9DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： SOIC-28
文件頁數(shù)： 157/160頁
文件大小： 2208K
代理商： MC68HC705P9DW
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.
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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For More Information On This Product,
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相關(guān)PDF資料
PDF描述
MC68HC705P9MS 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
MC68HC705P9CDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705P9VS 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
MC68HC705P9S 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
MC68HC705P9VDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
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