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参数资料
型号： MC68HC705RC17P
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 2.097 MHz, MICROCONTROLLER, PDIP28
封装： PLASTIC, DIP-28
文件页数： 73/126页
文件大小： 3079K
代理商： MC68HC705RC17P
NON-DISCLOSURE
AGREEMENT
REQUIRED
Resets
General Release Specification
MC68HC705RC17 — Rev. 2.0
Resets
5.5.2.4 COP Watchdog Timer Considerations
The COP watchdog timer is active in all modes of operation if enabled
by a mask option. If the COP watchdog timer is selected by a mask
option, any execution of the STOP instruction (either intentionally or
inadvertently due to the CPU being disturbed) causes the oscillator to
halt and prevents the COP watchdog timer from timing out. If the COP
watchdog timer is selected by a mask option, the COP resets the MCU
when it times out. Therefore, it is recommended that the COP watchdog
be disabled for a system that must have intentional uses of the wait
mode for periods longer than the COP time out period.
The recommended interactions and considerations for the COP
watchdog timer, STOP instruction, and WAIT instruction are
summarized in Table 5-1.
5.5.3 Illegal Address
An illegal address reset is generated when the CPU attempts to fetch an
instruction from I/O address space ($0000 to $001F).
Table 5-1. COP Watchdog Timer Recommendations
IF the Following Conditions Exist:
THEN the COP Watchdog Timer
Should Be:
Wait Time
Wait Time Less than COP Time Out
Enable or Disable COP by Mask Option
Wait Time More than COP Time Out
Disable COP by Mask Option
Any Length Wait Time
Disable COP by Mask Option
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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