
Rev.2.10 Apr 14, 2006 page 275 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 21. Flash Memory Version
Figure 21.9 Block Erase Command
21.3.5.5 Block Erase Command
The block erase command erases each block.
By writing xx20h in the first bus cycle and xxD0h to the highest-order even address of a block in the
second bus cycle, an auto-erase operation (erase and verify) will start in the specified block.
The FMR00 bit in the FMR0 register indicates whether an auto-erase operation has been completed.
The FMR00 bit is set to 0 (busy) during auto-erasure 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 21.3.8 Full Status Check.)
Figure 21.9 shows a flow chart of the Block Erase Command.
The lock bit protects each block from being programmed inadvertently. (Refer to 21.3.6 Data Protect
Function.)
In EW1 mode, do not execute this command on the block where the rewrite control program is allocated.
In EW0 mode, the MCU enters read status register mode as soon as an auto-erase operation starts. The
status register can be read. The SR7 bit in the status 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 MCU remains in read status
register mode until the read array command or read lock bit status command is written. Also execute the
clear status register command and block erase command at least 3 times until an erase error is not
generated when an erase error is generated.
Write xxD0h to the highest-order
block address
Start
YES
NO
FMR00=1?
Full status check
(2) (3)
Block erase operation is
completed
Write the command code xx20h
NOTES:
1.Write the command code and data to even addresses.
2.Refer to Figure 21.12 Full Status Check and Handling Procedure for Each Error.
3.Execute the clear status register command and block erase command at least 3 times
until an erase error is not generated when an erase error is generated.
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