M16CSLASH1N datasheet(194/238 Pages) RENESAS

194 / 238 page

Rev.1.00

Oct 20, 2004

page 182 of 222

M16C/1N Group

19. Flash Memory Version

REJ09B0007-0100Z

Flash memory control register 1

Symbol

Address

After reset

FMR1

01B516

0000XX0X2

b2 b1

Bit symbol

Bit name

Function

EW1 mode select bit

(Note 1)

0 : EW0 mode

1 : EW1 mode

FMR11

Reserved bit

Set to "0"

Reserved bit

The value in this bit when read is

indeterminate.

Reserved bit

Set to "0"

Block 0-3 rewrite enable bit

(Note 2)

0 : Disables rewriting

1 : Enables rewriting

FMR16

(b0)

(b5-b4)

(b7)

Reserved bit

The value in this bit when read is

indeterminate.

(b3-b2)

Note 1: When setting this bit to "1", write a "0" and then a "1" in succession while the FMR01 bit is "1". Make sure no

interrupts will occur before completion of these two write operations.

The FMR01 and FMR11 bits both are cleared to "0" by setting the FMR01 bit to "0".

Note 2: When setting this bit to "1", write a "0" and then a "1" to it in succession while the FMR01 bit is "1". Make sure

no interrupts will occur before completion of these two write operations.

Flash memory control register 4

Symbol

Address

After reset

FMR4

01B316

010000002

b2 b1

Bit symbol

Bit name

Function

Suspend request bit (Note 2)

0 : Erase restart

1 : Suspend request

FMR41

Reserved bit

Set to "0"

Suspend enable bit (Note 1)

0 : Invalid

1 : Valid

FMR40

Suspend status

0 : Erase active

1 : Erase inactive

(erasure-suspend)

FMR46

Set to "0"

(b7)

Reserved bits

(b5-b2)

Note 1: When setting this bit to "1", write a "0" and then a "1" to it in succession. Make sure no interrupts will occur

before completion of these two write operations.

Note 2: This bit is valid only when the FMR40 bit is "1" and can be written in only the period from issuing an erase

command until completion of erasing.

• In EW0 mode, this bit can be set to "0" or "1" by program.

• In EW1 mode, this bit is automatically set to "1" when a maskable interrupt occurs during erasure execution

while the FMR40 bit is "1". It can not be set to "1" by program. (Writing "0" is available.)

Figure 19.5 FMR1 Register, FMR4 Register

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