M68HC08 datasheet(41/188 Pages) FREESCALE

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Memory

FLASH 2TS Memory

MC68HC908RF2 — Rev. 4.0

Data Sheet

MOTOROLA

Memory

2.5.9 Low-Power Modes

The WAIT and STOP instructions put the MCU in low power-consumption standby

modes.

2.5.9.1 Wait Mode

Putting the MCU into wait mode while the FLASH 2TS is in read mode does not

affect the operation of the FLASH 2TS 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 2TS. When the MCU is put into wait mode, the charge

pump for the FLASH 2TS is disabled so that either a program or erase operation

will not 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 mode 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.

2.5.9.2 Stop Mode

When the MCU is put into stop mode, if the FLASH 2TS 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 2TS. When the MCU is put into stop mode, the charge

pump for the FLASH 2TS is disabled so that either a program or erase operation

will not 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 mode now must 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.

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