參數(shù)資料
型號: MC68HC05P9AVP
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 52/158頁
文件大?。?/td> 1106K
代理商: MC68HC05P9AVP
Resets and Interrupts
52
Resets and Interrupts
MOTOROLA
COP Watchdog
Reset
A timeout of the COP watchdog generates a COP reset. The COP
watchdog is part of a software error detection system and must be
cleared periodically to start a new timeout period. To clear the COP
watchdog and prevent a COP reset, write a logic 0 to bit 0 (COPC) of the
COP register at location $1FF0.
Low-Voltage Protection
A drop in power supply voltage below the minimum operating V
DD
voltage is called a brownout condition. A brownout while the MCU is in a
non-reset state can corrupt MCU operation and necessitate a power-on
reset to resume operation.
The best protection against brownout is an undervoltage sensing circuit
that pulls theRESET pin low when it detects a low-power supply voltage.
The undervoltage sensing circuit may be made of discrete components
or an integrated circuit can be used.
For information about brownout and the COP watchdog, see the
Computer Operating Properly Watchdog
section.
8-mc68hc05p9a
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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