MC68HC08XL36 Datasheet, PDF (72/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Low-Power Modes
Introduction
The WAIT instruction puts the MCU in a low-power standby mode in
which the CPU clock is disabled but the bus clock continues to run. The
STOP instruction disables both the CPU clock and the bus clock.
Central Processor Unit (CPU)
Wait Mode
The WAIT instruction:
• Clears the interrupt mask (I bit) in the condition code register,
enabling interrupts. After exit from wait mode by interrupt, the I bit
remains clear. After exit by reset, the I bit is set.
• Disables the CPU clock.
Stop Mode
The STOP instruction:
• Clears the interrupt mask (I bit) in the condition code register,
enabling external interrupts. After exit from stop mode by external
interrupt, the I bit remains clear. After exit by reset, the I bit is set.
• Disables the CPU clock.
After exiting stop mode, the CPU clock begins running after the oscillator
stabilization delay.
MC68HC08XL36
72
Low-Power Modes
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