M30218 Datasheet, PDF (169/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Appendix Standard Serial I/O Mode
Mitsubishi microcomputers
M30218 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 RTS0 (BUSY) signal changes from the “H” to the “L” level. The result of the
erase operation can be known by reading the status register.
CLK0
RxD0
TxD0
A716 D016
RTS0(BUSY)
Figure DD-7. Timing for erasing all unlocked blocks
Read Lock Bit Status Command
This command reads the lock bit status of the specified block. Execute the read lock bit status com-
mand as explained here following.
(1) Send the “7116” 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 respec-
tively.
(3) The lock bit data of the specified block is output in the 4th byte of the transmission. Write the
highest address of the specified block for addresses A8 to A23.
The M30218 group (flash memory version) does not have the lock bit, so the read value is always
“1” (block unlock).
CLK0
RxD0
TxD0
RTS0(BUSY)
7116
A8 to A16 to
A15
A23
DQ6
Figure DD-8. Timing for reading lock bit status
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