M16CSLASH1N datasheet(201/238 Pages) RENESAS

201 / 238 page

Rev.1.00

Oct 20, 2004

page 189 of 222

M16C/1N Group

19. Flash Memory Version

REJ09B0007-0100Z

Start

Program

completed

YES

Write the command code ’xx4016’

to the write address (Note 1)

Write data to the write address

(Note 1)

FMR00=1?

Full status check (Note 2)

Note 1: Write the command code and data at even number.

Note 2: See Figure 19.12 Full status check flowchart, handling each error generated.

Figure 19.9 Program flowchart

(4) Program

This command writes data to the flash memory in 1 word (2 byte) units.

Write 'xx4016' 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 FMR0 register's FMR00 bit 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 FMR0 register's FMR06 bit after auto programming has finished, and the result of auto

programming can be known (refer to 19.5.6 Full Status Check).

Figure 19.9 shows an example of program flowchart.

Writing over already programmed addresses is inhibited.

Also, block 0 to 3 do not accept the program command while the FMR 1 register's FMR 16 bit is "0"

and the FMR0 register's FMR02 bit is "0" (Inhibit rewriting.)

To execute another command immediately after the program command, use the same write address

that was specified in the second bus cycle of the program command for the address value to be

specified in the first bus cycle of the next command.

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.

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