R8C2K datasheet(394/471 Pages) RENESAS

394 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 377 of 450

REJ09B0406-0110

• 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.

When suspend function disabled, the FMR00 bit is set to 0 during auto-programming and set to 1 when auto-

programming completes. When suspend function enabled, the FMR44 bit is set to 1 during auto-programming

and set to 0 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.

Figure 20.11 shows the Program Command in EW0 Mode (When Suspend Function Disabled). Figure 20.12

shows the Program Command in EW0 Mode (When Suspend Function Enabled).

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 20.11

Program Command in EW0 Mode (When Suspend Function Disabled)

Start

Write the command code 40h to

the write address

Write data to the write address

FMR00 = 1?

Full status check

Program completed

Yes

R8C2K Datasheet(PDF) 394 Page - Renesas Technology Corp