R8C2K datasheet(384/471 Pages) RENESAS

384 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 367 of 450

REJ09B0406-0110

20.4.1

The registers used in CPU rewrite mode are described.

20.4.1.1

FMR0 Register (FMR0)

Figure 20.4 shows the FMR0 Register.

Figure 20.4

FMR0 Register

Flash Memory Control Register 0

Symbol

Address

After Reset

FMR0

01B7h

00000001b

Bit Symbol

Bit Name

Function

RY/BY

____

status flag

NOTES:

6. When setting the FMR01 bit to 0 (CPU rew rite mode disabled), the FMR02 bit is set to 0 (rew rite disabled).

FMR07

b3 b2 b1 b0

0 : Rew rite disabled

1 : Rew rite enabled

Flash memory stop bit(3, 5)

0 : Flash memory operates

1 : Flash memory stops

(low -pow er consumption state

and flash memory initialization)

FMR01

Blocks 0 and 1 rew rite enable

bit(2, 6)

0 : Busy (w riting or erasing in progress)

1 : Ready

CPU rew rite mode select bit(1)

0 : CPU rew rite mode disabled

1 : CPU rew rite mode enabled

b7 b6 b5 b4

Reserved bits

Set to 0.

FMR02

—

(b5-b4)

FMR00

FMSTP

This bit is set to 0 by executing the clear status command.

This bit is enabled w hen the FMR01 bit is set to 1 (CPU rew rite mode). When the FMR01 bit is set to 0, w riting 1 to the

FMSTP bit causes the FMSTP bit to be set to 1. The flash memory does not enter low -pow er consumption state nor is

it initialized.

FMR06

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. Enter read array mode and set this bit to 0.

Set this bit to 1 immediately after setting it first to 0 w hile the FMR01 bit is set to 1.

Do not generate an interrupt betw een setting the bit to 0 and setting it to 1.

Set this bit by a program located in a space other than the flash memory.

Program status flag(4)

0 : Completed successfully

1 : Terminated in error

Erase status flag(4)

0 : Completed successfully

1 : Terminated in error

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