R28 datasheet(372/473 Pages) RENESAS

372 / 473 page

R8C/28 Group, R8C/29 Group

19. Flash Memory

Rev.2.10

Sep 26, 2008

Page 353 of 441

REJ09B0279-0210

Figure 19.9 shows the How to Set and Exit EW0 Mode. Figure 19.10 shows the How to Set and Exit EW1

Mode.

Figure 19.9

How to Set and Exit EW0 Mode

Figure 19.10

How to Set and Exit EW1 Mode

Set registers(1) CM0 and CM1

Transfer a rewrite control program which uses CPU

rewrite mode to the RAM.

Jump to the rewrite control program which has been

transferred to the RAM.

(The subsequent process is executed by the rewrite

control program in the RAM.)

Write 0 to the FMR01 bit before writing 1

(CPU rewrite mode enabled)(2)

Execute the read array command(3)

Execute software commands

Write 0 to the FMR01 bit

(CPU rewrite mode disabled)

Jump to a specified address in the flash memory

Rewrite control program

NOTES:

1. Select 5 MHz or below for the CPU clock by the CM06 bit in the CM0 register and bits CM16 to CM17 in the CM1 register.

2. To set the FMR01 bit to 1, write 0 to the FMR01 bit before writing 1. Do not generate an interrupt between writing 0 and 1.

Write to the FMR01 bit in the RAM.

3. Disable the CPU rewrite mode after executing the read array command.

EW0 Mode Operating Procedure

Write 0 to the FMR01 bit before writing 1 (CPU

rewrite mode enabled)(1)

Write 0 to the FMR11 bit before writing 1 (EW1

mode)

Execute software commands

Write 0 to the FMR01 bit

(CPU rewrite mode disabled)

NOTE:

1. To set the FMR01 bit to 1, write 0 to the FMR01 bit before writing 1.

Do not generate an interrupt between writing 0 and 1.

EW1 Mode Operating Procedure

Program in ROM

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