M16C62_N Datasheet, PDF (276/621 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY

Appendix Standard Serial I/O Mode (Flash Memory Version)
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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.
CLK1
RxD1
(M16C reception data)
TxD1
(M16C transmit data)
RTS1(BUSY)
A716 D016
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
(M16C reception data)
TxD1
(M16C transmit data)
RTS1(BUSY)
7716
A8 to A16 to
A15 A23
D016
Figure 1.31.9. Timing for the lock bit program
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