參數(shù)資料
型號(hào)： MC68HC805K3DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝： SOIC-16
文件頁數(shù)： 73/119頁
文件大?。?/td> 2870K
代理商： MC68HC805K3DW
General Release Specification
Low-Power Modes
MC68HC805K3 — Rev. 1.0
Operational Modes
57
6.3.3 Wait Mode
The WAIT instruction places the MCU in a low-power wait mode, which
consumes more power than stop mode. In wait mode, the internal
processor clock is halted, suspending all processor and internal bus
activity. Internal timer clocks remain active, permitting interrupts to be
generated from the timer or a reset to be generated from the COP
watchdog timer. Execution of the WAIT instruction automatically clears
the I bit in the condition code register and sets the IRQE enable bit in the
IRQ status/control register so that the IRQ external interrupt is enabled.
All other registers, memory, and input/output lines remain in their
previous states.
If timer interrupts are enabled, a timer interrupt causes the processor to
exit wait mode and resume normal operation. Thus, the timer can be
used to generate a periodic exit from wait mode. Wait mode also is
exited when an external IRQ or RESET occurs.
6.3.4 COP Watchdog Timer Considerations
If the COP watchdog timer is enabled by the mask option register bit, any
execution of the STOP instruction (either intentional or inadvertent due
to the CPU being disturbed) causes the oscillator to halt and prevent the
COP watchdog timer from timing out unless the STOP instruction is
disabled by a mask option register bit.
If the mask option register bit is selected to enable the COP watchdog
timer, the COP resets the MCU when it times out. Therefore, it is
recommended that the mask option register bit be selected to disable the
COP watchdog for a system that must have intentional uses of the wait
mode for periods longer than the COP timeout period.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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