R28 datasheet(375/473 Pages) RENESAS

375 / 473 page

R8C/28 Group, R8C/29 Group

19. Flash Memory

Rev.2.10

Sep 26, 2008

Page 356 of 441

REJ09B0279-0210

19.4.3.4

Program Command

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

By writing 40h in the first bus cycle and data in the second bus cycle to the write address, an auto-program

operation (data program and verify) will start. Make sure the address value specified in the first bus cycle is the

same address as the write address specified in the second bus cycle.

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 19.4.5 Full Status Check).

Do not write additions to the already programmed addresses.

When the FMR02 bit in the FMR0 register is set to 0 (rewriting disabled) or the FMR02 bit is set to 1 (rewriting

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

block 0 are not acknowledged. When the FMR16 bit is set to 1 (rewriting disabled), program commands

targeting block 1 are not acknowledged.

Figure 19.12 shows the Program Command (When Suspend Function Disabled). Figure 19.13 shows the

Program Command (When Suspend Function Enabled).

In EW1 mode, do not execute this command for any address which a rewrite control program is allocated.

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

status register can be read. The status register bit 7 (SR7) is set to 0 at the same time auto-programming starts

and set back to 1 when auto-programming completes. In this case, the MCU remains in read status register

mode until the next read array command is written. The status register can be read to determine the result of

auto-programming after auto-programming has completed.

Figure 19.12

Program Command (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

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