参数资料
型号: MC68HC705J1AVS
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
封装: WINDOWED, CERAMIC, DIP-20
文件页数: 161/162页
文件大小: 3213K
代理商: MC68HC705J1AVS
Technical Data
MC68HC705J1A — Rev. 4.0
Computer Operating Properly (COP) Module
Computer Operating Properly (COP) Module
7.3 Operation
Operation of the COP is described in this subsection.
7.3.1 COP Watchdog Timeout
Four counter stages at the end of the timer make up the COP watchdog.
The COP resets the MCU if the timeout period occurs before the COP
watchdog timer is cleared by application software and the IRQ/VPP pin
voltage is between VSS and VDD. Periodically clearing the counter starts
a new timeout period and prevents COP reset. 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 depends on a power supply voltage at or above a
minimum specification and is not guaranteed to protect against
brownout.
7.3.2 COP Watchdog Timeout Period
The COP watchdog timer function is implemented by dividing the output
of the real-time interrupt circuit (RTI) by eight. The RTI select bits in the
timer status and control register control RTI output, and the selected
output drives the COP watchdog. See timer status and control register
NOTE:
The minimum COP timeout period is seven times the RTI period. The
COP is cleared asynchronously with the value in the RTI divider; hence,
the COP timeout period will vary between 7x and 8x the RTI period.
7.3.3 Clearing the COP Watchdog
To clear the COP watchdog and prevent a COP reset, write a logic 0 to
bit 0 (COPC) of the COP register at location $07F0 (see Figure 7-1).
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