M16CSLASH1N datasheet(191/238 Pages) RENESAS

191 / 238 page

Rev.1.00

Oct 20, 2004

page 179 of 222

M16C/1N Group

19. Flash Memory Version

REJ09B0007-0100Z

19.5.1 EW0 mode

The microcomputer is placed in CPU rewrite mode by setting the FMR0 register's FMR01 bit to "1"

(CPU rewrite mode enabled), ready to accept commands. In this case, because the FMR1 register's

FMR11 bit = 0, EW0 mode is selected. The FMR01 bit can be set to "1" by writing "0" and then "1" in

succession.

Use software commands to control program and erase operations. Read the FMR0 register or status

When shifting to erasure-suspend during auto erasing, set the FMR40 bit to "1" (Suspend enable) and

the FMR41 bit to "1" (Suspend request).

After waiting for td (SR-ES) time, access user ROM area after confirming that the FMR46bit has been

set to "1" (Erase inactive).

Setting the FMR41 bit to "0" (Erase restart), the erasure operation is resumed.

19.5.2 EW1 mode

EW1 mode is selected by setting FMR11 bit to "1" (by writing "0" and then "1" in succession) after

setting the FMR01 bit to "1" (by writing "0" and then "1" in succession).

Read the FMR0 register to check the status of program or erase operation at completion. The status

When enabling the erasure-suspend feature, execute the block erase command after setting the

FMR40 bit to "1" (Suspend enable).

In addition, the interrupt for shifting to erasure suspend has to have been enabled beforehand.

When shifting to erasure-suspend after td (SR-ES) time from interrupt request, the interrupt request is

accepted.

When the interrupt request occurs, the FMR41bit is set to "1" (Suspend request) automatically and

erasure operation is suspended.

After processing the interrupt, when the FM00 bit is "0" (Busy (being erased)), set the FMR41 bit to "0"

and re-execute the block erase command.

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