参数资料
型号: MC68HC05RC18DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 73/124页
文件大小: 457K
代理商: MC68HC05RC18DW
NON-DISCLOSURE
AGREEMENT
REQUIRED
Resets
General Release Specification
MC68HC05RC18 Rev. 2.0
52
Resets
MOTOROLA
time counting will begin. If an external IRQ is used to exit stop mode, the
COP counter does not wait for the completion of the 4064 POR cycles
but does count these cycles.
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 timeout period.
The recommended interactions and considerations for the COP
watchdog timer, STOP instruction, and WAIT instruction are
summarized in Table 5-1.
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 Timeout
Enable or Disable COP by Mask Option
Wait Time More than COP Timeout
Disable COP by Mask Option
Any Length Wait Time
Disable COP by Mask Option
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