MC68HC08XL36 Datasheet, PDF (74/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Low-Power Modes
Computer Operating Properly Module (COP)
Wait Mode
The COP remains active in wait mode. To prevent a COP reset during
wait mode, periodically clear the COP counter in a CPU interrupt routine
or a DMA service routine.
Stop Mode
Stop mode turns off the CGMXCLK input to the COP and clears the COP
prescaler. Service the COP immediately before entering or after exiting
stop mode to ensure a full COP timeout period after entering or exiting
stop mode.
To prevent inadvertently turning off the COP with a STOP instruction, a
mask option that disables the STOP instruction is available.
Direct Memory Access Module (DMA)
Wait Mode
If enabled by the DMAWE bit in the DMA status and control register, the
DMA remains active in wait mode. The DMA can transfer data to and
from peripherals while the MCU remains in wait mode.
If the WAIT instruction occurs during a DMA transfer while DMAWE is
set, the DMA transfer continues to completion. If the DMAWE bit is clear,
a WAIT instruction suspends the current DMA transfer. If the DMA
priority bit (DMAP) is set, the suspended transfer resumes when the
MCU exits wait mode.
Stop Mode
The DMA is inactive during stop mode. A STOP instruction suspends
any DMA transfer in progress. If an external interrupt brings the MCU out
of stop mode and the DMA priority bit (DMAP) is set, the suspended
DMA transfer resumes. If a reset brings the MCU out of stop mode, the
transfer is aborted.
MC68HC08XL36
74
Low-Power Modes
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