MC68HC908GR4MP datasheet(115/286 Pages) FREESCALE

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Wait Mode

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

115

The resultant 16-bit address is used for specifying the start address of the FLASH memory for block

protection. The FLASH is protected from this start address to the end of FLASH memory, at $FFFF.

With this mechanism, the protect start address can be $XX00, $XX40, $XX80, and $XXC0 (64 bytes

page boundaries) within the FLASH memory.

Figure 11-4. FLASH Block Protect Start Address

Examples of protect start address:

11.8 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 not be any memory activity since the CPU is inactive.

The WAIT instruction should not be executed while performing a program or erase operation on the

FLASH, otherwise the operation will discontinue, and the FLASH will be on Standby Mode.

11.9 STOP Mode

Putting the MCU into stop mode while the FLASH is in read mode does not affect the operation of the

FLASH memory directly, but there will not be any memory activity since the CPU is inactive.

The STOP instruction should not be executed while performing a program or erase operation on the

FLASH, otherwise the operation will discontinue, and the FLASH will be on Standby Mode

NOTE

Standby Mode is the power saving mode of the FLASH module in which all

internal control signals to the FLASH are inactive and the current

consumption of the FLASH is at a minimum.

Table 11-1. Examples of Protect Start Address

BPR[7:0]

Start of Address of Protect Range

$80

The entire FLASH memory is protected.

$81 (1000 0001)

$E040 (1110 0000 0100 0000)

$82 (1000 0010)

$E080 (1110 0000 1000 0000)

and so on...

$FE (1111 1110)$FF80 (1111 1111 1000 0000)

$FF

The entire FLASH memory is not protected.

Note: The end address of the protected range is always $FFFF.

FLBPR value

16-bit memory address

000

Start address of FLASH block protect

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