M30622M4 MITSUBISHI [Mitsubishi Electric Semiconductor], M30622M4 Datasheet - Page 243

• Manufacturer Part Number: M30622M4
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

CPU Rewrite Mode (Flash Memory Version)
Figure 1.29.5. Block erase flowchart
Block Erase Command (20
By writing the command code “20
in the second bus cycle that follows to the block address of a flash memory block, the system initiates
an auto erase (erase and erase verify) operation.
Whether the auto erase operation is completed can be confirmed by reading the status register or the
flash memory control register 0. At the same time the auto erase operation starts, the read status
register mode is automatically entered, so the content 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 upon completion of the auto erase operation. In this case, the read status register mode remains
active until the Read Array command (FF
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 is completed as is the status register bit 7.
After the auto erase operation is completed, the status register can be read out to know the result of
the auto erase operation. For details, refer to the section where the status register is detailed.
Figure 1.29.5 shows an example of a block erase flowchart.
Each block of the flash memory can be protected against erasure by using a lock bit. For details, refer
to the section where the data protect function is detailed.
____
16
/D0
16
16
Check full status check
)
” in the first bus cycle and the confirmation command code “D0
RY/BY status flag
Block address
Write D0
Block erase
Write 20
completed
16
Start
= 1?
) or Read Lock Bit Status command (71
YES
16
16
NO
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
16
Mitsubishi microcomputers
M16C / 62 Group
) is written or the
16
”
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