M32CSLASH86 datasheet(431/505 Pages) RENESAS

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Page 408

25. Flash Memory Version

)

(

Write "xxD016" to the highest-

order block address

Start

Block erase operation

is completed

YES

Write the command code "xx2016"

FMR00=1?

Full status check

NOTES:

1. Write the command code and data to even addresses.

25.3.5.5 Block Erase Command

The block erase command erases each block.

Auto erase operation (erase and verify) will start in the specified block by writing command code

"xx2016" in the first bus cycle and "xxD016" to the highest-order even address of a block in the second

bus cycle.

The FMR00 bit in the FMR0 register indicates whether or not an auto erase operation has been

completed. The FMR00 bit is set to "0" (busy) during auto erase and to "1" (ready) when the auto

erase operation is completed.

After the completion of an auto erase operation, the FMR07 bit in the FMR0 register indicates whether

or not the auto erase operation has been completed as expected. (Refer to 25.3.8 Full Status

Check.)

Figure 25.10 shows a flow chart of the block erase command programming.

The lock bit can protect each block from being programmed inadvertently. (Refer to 25.3.6 Data

Protect Function.)

In EW mode 1, do not execute this command on the block where the rewrite control program is allocated.

In EW mode 0, the microcomputer enters read status register mode as soon as an auto erase opera-

tion starts. The SRD register can be read. The SR7 bit in the SRD register is set to "0" at the same

time an auto erase operation starts. It is set to "1" when an auto erase operation is completed. The

microcomputer remains in read status register mode until the read array command or read lock bit

status command is written.

Figure 25.10 Block Erase Command

M32C/86 Datasheet(PDF) 431 Page - Renesas Technology Corp