Flash Memory
275
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
Start
Program
completed
YES
NO
Note: Write the command code and data at even number.
Write the command code ‘xx40
16
’
to the write address
Write data to the write address
FMR00=1
Full status check
Figure 1.27.8. Program Command
Clear Status Register Command (50
16
)
This command clears the status register to “0”.
Write ‘xx50
16
’ in the first bus cycle, and the FMR06 to FMR07 bits in the FMR0 register and SR4 to
SR5 in the status register will be cleared to “0”.
Program Command (40
16
)
This command writes data to the flash memory in 1 word (2 byte) units.
Write ‘xx40
16
’ in the first bus cycle and write data to the write address in the second bus cycle, and an
auto program operation (data program and verify) will start. Make sure the address value specified in
the first bus cycle is the same even address as the write address specified in the second bus cycle.
Check the FMR00 bit in the FMR0 register to see if auto programming has finished. The FMR00 bit is
“0” during auto programming and set to “1” when auto programming is completed.
Check the FMR06 bit in the FMR0 register after auto programming has finished, and the result of auto
programming can be known. (Refer to “Full Status Check.”)
Each block can be protected against programming by a lock bit. (Refer to “Data Protect Function.”)
Writing over already programmed addresses is inhibited.
In EW1 mode, do not execute this command on any address at which the rewrite control program is
located.
In EW0 mode, the microcomputer goes to read status register mode at the same time auto program-
ming starts, making it possible to read the status register. The status register bit 7 (SR7) is cleared to
“0” at the same time auto programming starts, and set back to “1” when auto programming finishes. In
this case, the microcomputer remains in read status register mode until a read command is written
next. The result of auto programming can be known by reading the status register after auto program-
ming has finished.