M32CSLASH8B datasheet(327/406 Pages) RENESAS

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Under development

M32C/8B Group

23. Flash Memory

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 310 of 385

Figure 23.8

Setting Procedure for EW1 Mode

FMR2 register: FMR20 bit = 1

Execute the software commands

FMR0 register: FMR01 bit = 0

NOTE:

1. Do not use EW1 mode in memory expansion mode or boot mode.

Start

Set the CPU clock frequency to 10 MHz

or lower in CPU rewrite mode

End

Internal memory wait state inserted

CPU rewrite mode enabled

- To set the FMR01 bit to 1, write a 1 to the FMR01 bit

immediately after writing a 0.

Write the value to the FMR0 register in 8-bit units.

Do not generate an interrupt or a DMA or DMACII transfer

between these two setting.

- Set it while the NMI pin level is held "H".

Enter EW1 mode

- Write a 1 to the FMR30 bit while the FMR01 bit is set to 1.

CPU rewrite mode disabled

- To change the FMR01 bit from 1 to 0, enter read array mode

and then write to address 0057h in 16-bit units.

Set the eight high-order bits to 00h.

PM1 register: PM12 bit = 1

MCD register

FMR3 register: FMR30 bit = 1

FMR0 register: FMR01 bit = 1

FMR0 register: FMR01 bit = 0

Enable writing to the FMR3 register

Exit EW1 mode

FMR3 register: FMR30 bit = 0

FMR2 register: FMR20 bit = 0

Disable writing to the FMR3 register

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