MC68HC08XL36 Datasheet, PDF (75/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Low-Power Modes
External Interrupt Module (IRQ)
Entering stop mode when a DMA channel is enabled may fail to clear the
the interrupt mask (I bit) in the condition code register. To make sure the
I bit is cleared when entering stop mode:
• Before executing the STOP instruction, wait until any current DMA
transfer is complete. Then disable DMA transfers by clearing bits
TEC[2:0] in DMA control register 1.
Or,
• Execute the clear-interrupt-mask instruction (CLI) before entering
stop mode.
External Interrupt Module (IRQ)
Wait Mode
The IRQ module remains active in wait mode. Clearing the IMASK1 or
IMASK2 bit in the IRQ status and control register enables IRQ1 or IRQ2
CPU interrupt requests to bring the MCU out of wait mode.
Stop Mode
The IRQ module remains active in stop mode. Clearing the IMASK1 or
IMASK2 bit in the IRQ status and control register enables IRQ1 or IRQ2
CPU interrupt requests to bring the MCU out of stop mode.
Keyboard Interrupt Module (KBI)
Wait Mode
The keyboard interrupt module remains active in wait mode. Clearing the
IMASKK bit in the keyboard status and control register enables keyboard
interrupt requests to bring the MCU out of wait mode.
Stop Mode
The keyboard interrupt module remains active in stop mode. Clearing
the IMASKK bit in the keyboard status and control register enables
keyboard interrupt requests to bring the MCU out of stop mode.
5-lp24_e
MOTOROLA
Low-Power Modes
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MC68HC08XL36
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