Freescale Semiconductor, Inc.
FLASH-1 Memory
Low-Power Modes
4.9 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
4.9.1 Wait Mode
Putting the MCU into wait mode while the FLASH is in read mode does
not affect the operation of the FLASH memory directly, but there will be
no memory activity since the CPU is inactive.
The WAIT instruction should not be executed while performing a
program or erase operation on the FLASH. When the MCU is put into
wait mode, the charge pump for the FLASH is disabled so that neither a
program nor erase operation will continue. If the memory is in either
program mode (PGM = 1, HVEN = 1) or erase mode (ERASE = 1,
HVEN = 1), then it will remain in that mode during wait. Exit from wait
must now be done with a reset rather than an interrupt because if exiting
wait with an interrupt, the memory will not be in read mode and the
interrupt vector cannot be read from the memory.
4.9.2 Stop Mode
When the MCU is put into stop mode, if the FLASH is in read mode, it
will be put into low-power standby.
The STOP instruction should not be executed while performing a
program or erase operation on the FLASH. When the MCU is put into
stop mode, the charge pump for the FLASH is disabled so that neither a
program nor erase operation will continue. If the memory is in either
program mode (PGM = 1, HVEN = 1) or erase mode (ERASE = 1,
HVEN = 1), then it will remain in that mode during stop. Exit from stop
must now be done with a reset rather than an interrupt because if exiting
stop with an interrupt, the memory will not be in read mode and the
interrupt vector cannot be read from the memory.
MC68HC908AS60 — Rev. 1.0
Technical Data
FLASH-1 Memory
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