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Chapter 29 128 Kbyte Flash Module (S12XFTX128K1V1)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

1213

29.4.2.1

Erase Verify Command

The erase verify operation will verify that a Flash block is erased.

An example ﬂow to execute the erase verify operation is shown in Figure 29-23. The erase verify command

write sequence is as follows:

1. Write to a Flash block address to start the command write sequence for the erase verify command.

The address and data written will be ignored.

2. Write the erase verify command, 0x05, to the FCMD register.

3. Clear the CBEIF ﬂag in the FSTAT register by writing a 1 to CBEIF to launch the erase verify

command.

After launching the erase verify command, the CCIF ﬂag in the FSTAT register will set after the operation

has completed unless a new command write sequence has been buffered. The number of bus cycles

required to execute the erase verify operation is equal to the number of addresses in a Flash block plus 14

bus cycles as measured from the time the CBEIF ﬂag is cleared until the CCIF ﬂag is set. Upon completion

of the erase verify operation, the BLANK ﬂag in the FSTAT register will be set if all addresses in the

selected Flash block are veriﬁed to be erased. If any address in a selected Flash block is not erased, the

erase verify operation will terminate and the BLANK ﬂag in the FSTAT register will remain clear. The

MRDS bits in the FTSTMOD register will determine the sense-amp margin setting during the erase verify

operation.

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