R8CSLASH2G datasheet(278/344 Pages) RENESAS

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R8C/2G Group

20. Flash Memory

Rev.1.00

Apr 04, 2008

Page 258 of 318

REJ09B0387-0100

• Program Command

The program command writes data to the flash memory in 1-byte units.

When 40h is written and then data is written to the write address, an auto-program operation (data program

and verify) starts.

The FMR00 bit in the FMR0 register can be used to determine whether auto-programming has completed.

The FMR00 bit is set to 0 during auto-programming and set to 1 when auto-programming completes.

The FMR06 bit in the FMR0 register can be used to determine the result of auto-programming after it has

been finished (refer to 20.4.2 Status Check Procedure).

Do not write additions to the already programmed addresses.

Also, when the FMR02 bit in the FMR0 register is set to 0 (rewrite disabled), or the FMR02 bit is set to 1

(rewrite enabled) and the FMR15 bit in the FMR1 register is set to 1 (rewrite disabled), program

commands targeting block 0 are not acknowledged. When the FMR 16 bit is set to 1 (rewrite disabled),

program commands targeting block 1 are not acknowledged.

Figure 20.10 shows the Program Command in EW0 Mode.

In EW0 mode, the MCU enters read status register mode at the same time auto-programming starts and the

status register can be read. In this case, the MCU remains in read status register mode until the next read

array command is written.

Figure 20.10

Program Command in EW0 Mode

Start

Write the command code 40h to

the write address

Write data to the write address

FMR00 = 1?

Full status check

Program completed

Yes

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