R8CSLASH2G datasheet(273/344 Pages) RENESAS

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R8C/2G Group

20. Flash Memory

Rev.1.00

Apr 04, 2008

Page 253 of 318

REJ09B0387-0100

20.4.1.3

FMR4 Register (FMR4)

Figure 20.5 shows the FMR4 Register.

Figure 20.5

FMR4 Register

• FMR43 Bit

When the auto-erase operation starts, the FMR43 bit is set to 1 (erase execution in progress).

When the auto-erase operation ends, the FMR43 bit is set to 0 (erase not executed).

• FMR44 Bit

When the auto-program operation starts, the FMR44 bit is set to 1 (program execution in progress).

When the auto-program operation ends, the FMR44 bit is set to 0 (program not executed).

• FMR46 Bit

The FMR46 bit is set to 0 (reading disabled) during auto-program or auto-erase execution. Do not access

the flash memory while this bit is set to 0.

• FMR47 Bit

Current consumption when reading the flash memory can be reduced by setting the FMR47 bit to 1

(enabled) in low-speed clock mode and low-speed on-chip oscillator mode.

Refer to 21.2.10 Low-Current-Consumption Read Mode for details of the handling procedure.

Flash Memory Control Register 4

Symbol

Address

After Reset

FMR4

01B3h

01000000b

Bit Symbol

Bit Name

Function

NOTES:

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

FMR47

Low -current-consumption

read mode enable bit (1, 2, 3)

0 : Disable

1 : Enable

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

Reserved bits

Set to 0.

—

Erase command flag

0 : Erase not executed

1 : Erase execution in progress

—

(b2-b0)

FMR43

b7 b6 b5 b4

Set the FMR01 bit to 0 (CPU rew rite mode disabled) in low -current-consumption read mode.

To set this bit to 1, set it 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.

b3 b2

b1 b0

—

(b5)

FMR44

Program command flag

0 : Program not executed

1 : Program execution in progress

FMR46

Read status flag

0 : Disables reading

1 : Enables reading

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