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M30245 Group
CPU Rewrite Mode
Rev.2.00
Oct 16, 2006
page 201 of 264
REJ03B0005-0200
5. Block Erase Command (2016/D016)
By writing the command code "2016" in the first bus cycle and the confirmation command code "D016" in the second bus
cycle to the block address of a flash memory block, the system initiates an auto erase (erase and erase verify)
operation. Figure 1.153 is an example of a block erase flowchart.
Read the status register or the flash memory control register 0 to confirm the completion of the auto erase operation.
At the same time the auto erase operation starts, the read status register mode is automatically entered, so the
contents of the status register can be read out. The status register bit 7 (SR7) is set to "0" at the same time the auto
erase operation starts and is returned to "1" when the auto erase operation is completed. The read status register
mode remains active until the Read Array command (FF16) or Read Lock Bit Status command (7116) is written or the
flash memory is reset using its reset bit.
The RY/BY status flag of the flash memory control register 0 is "0" during auto erase operation and "1" when the auto
erase operation and status register bit 7 is completed.
After the auto erase operation is completed, the status register can read for the results of the auto erase operation.
Refer to the status register for more details.
A lock bit protects each block of the flash memory against erasure. Refer to the data protect function section for more
details.
Figure 1.153. Block erase flowchart
6. Erase All Unlock Blocks Command (A716/D016)
By writing the command code "A716" in the first bus cycle and the confirmation command code "D016" in the second bus
cycle that follows, the system starts erasing blocks successively.
Reading the status register or the flash memory control register 0 confirms whether the erase all unlock blocks
command was terminated in the same way as for block erase. Also, the status register can read out the results of the
auto erase operation.
When the lock bit disable bit of the flash memory control register 0 = "1", all blocks are erased regardless of how the lock
bit is set. On the other hand, when the lock bit disable bit = "0", the function of the lock bit is effective and only unlocked
blocks (where lock bit data = "1") are erased.
Write 2016
Write D016
Block address
Check full status check
Block erase
completed
Start
RY/BY status flag
= 1?
NO
YES