R8CSLASH20 datasheet(404/501 Pages) RENESAS

404 / 501 page

R8C/20 Group, R8C/21 Group

19. Flash Memory

Rev.2.00 Aug 27, 2008

Page 388 of 458

REJ09B0250-0200

Figure 19.7

FMR4 Register

Flash Memory Control Register 4

Symbol

Address

After Reset

FMR4

01B3h

01000000b

Bit Symbol

Bit Name

Function

NOTES:

When setting this bit to 1, set to 1 immediately after setting it first to 0. Do not generate an interrupt betw een setting

the bit to 0 and setting it to 1.

This bit is enabled w hen the FMR40 bit is set to 1 (enable) and this bit can be w ritten during the period betw een

issuing an erase command and completing an erase (This bit is set to 0 during the periods other than above.)

In EW0 mode, this can be set to 0 or 1 by a program.

In EW1 mode, this bit is automatically set to 1 if a maskable interrupt is generated during an erase operation w hile the

FMR40 bit is set to 1. Do not set this bit to 1 by a program (0 can be w ritten).

b3 b2

Set to 0

b1 b0

FMR41

—

(b5-b2)

FMR40

FMR42

FMR44

b7 b6 b5 b4

Erase-suspend function

enable bit(1)

0 : Disables reading

1 : Enables reading

Reserved bit

0 : Disable

1 : Enable

Erase-suspend request bit(2)

0 : Erase restart

1 : Erase-suspend request

FMR43

Erase command flag

0 : Erase not executed

1 : During erase execution

0 : Disable

1 : Enable

FMR46

Program-suspend request bit(3) 0 : Program restart

1 : Program-suspend request

Set the FMR01 bit in the FMR0 register to 0 (CPU rew rite mode disabled) in low -pow er-consumption read mode.

In high-speed clock mode and high-speed on-chip oscillator mode, set the FMR47 bit to 0 (disabled).

Program command flag

0 : Program not executed

1 : During program execution

The FMR42 bit is enabled only w hen the FMR40 bit is set to 1 (enable) and programming to the FMR42 bit is enabled

until the auto-program ends since the program command is generated. (This bit is set to 0 during periods other than

above.)

In EW0 mode, 0 or 1 can be programmed to the FMR42 bit by a program.

In EW1 mode, the FMR42 bit is automatically set to 1 by generating a maskable interrupt during the auto-program

w hen the FMR40 bit is set to 1. 1 cannot be programmed to the FMR42 bit by a program.

FMR47

Read status flag

Low -pow er consumption read

mode enable bit (1,4)

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