M16CSLASH62 datasheet(276/621 Pages) RENESAS

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Appendix Standard Serial I/O Mode (Flash Memory Version)

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

261

Erase All Unlocked Blocks Command

This command erases the content of all blocks. Execute the erase all unlocked blocks command as

explained here following.

(1) Send the “A716” command code in the 1st byte of the transmission.

(2) Send the verify command code “D016” in the 2nd byte of the transmission. With the verify com-

mand code, the erase operation will start and continue for all blocks in the flash memory.

When block erasing ends, the RTS1 (BUSY) signal changes from the “H” to the “L” level. The result of the

erase operation can be known by reading the status register. Each block can be erase-protected with the

lock bit. For more information, see the section on the data protection function.

Figure 1.31.8. Timing for erasing all unlocked blocks

Lock Bit Program Command

This command writes “0” (lock) for the lock bit of the specified block. Execute the lock bit program

command as explained here following.

(1) Send the “7716” command code in the 1st byte of the transmission.

(2) Send addresses A8 to A15 and A16 to A23 in the 2nd and 3rd bytes of the transmission respectively.

(3) Send the verify command code “D016” in the 4th byte of the transmission. With the verify com-

mand code, “0” is written for the lock bit of the specified block. Write the highest address of the

specified block for addresses A8 to A23.

When writing ends, the RTS1 (BUSY) signal changes from the “H” to the “L” level. Lock bit status can

be read with the read lock bit status command. For information on the lock bit function, reset proce-

dure and so on, see the section on the data protection function.

CLK1

RxD1

TxD1

RTS1(BUSY)

A716

D016

(M16C reception data)

(M16C transmit data)

CLK1

RxD1

TxD1

RTS1(BUSY)

A8 to

A15

A16 to

A23

7716

D016

(M16C reception data)

(M16C transmit data)

Figure 1.31.9. Timing for the lock bit program

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