R8CSLASH15 datasheet(212/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 200 of 253

REJ09B0164-0210

18.4.2.10 FMR40 bit

The erase-suspend function is enabled by setting the FMR40 bit to “1” (enable).

18.4.2.11 FMR41 bit

In EW0 mode, the microcomputer enters erase-suspend mode when setting the FMR41 bit to “1” by a

program. The FMR41 bit is automatically set to “1” (requests erase-suspend) when an interrupt

request of an enabled interrupt is generated in EW1 mode, and then the microcomputer enters erase-

suspend mode.

Set the FMR41 bit to “0” (erase restart) when the auto-erase operation restarts.

18.4.2.12 FMR46 bit

The FMR46 bit is set to “0” (disable reading) during auto-erase execution and set to “1” (enables

reading) in erase-suspend mode. Do not access to the flash memory while this bit is set to “0”.

Figure 18.5

FMR0 Register

Flash Memory Control Register 0

Symbol

Address

After Reset

FMR0

01B7h

00000001b

Bit Symbol

Bit Name

Function

RY/BY

____

Status Flag

NOTES :

FMR07

b3 b2 b1 b0

0 : Disables rew rite

1 : Enables rew rite

Flash Memory Stop Bit(3, 5)

0 : Enables flash memory operation

1 : Stops flash memory

(Enters low -pow er consumption state

and flash memory is reset)

FMR01

Block 0, 1 Rew rite Enable Bit(2, 6)

0 : Busy (During w riting or erasing)

1 : READY

CPU Rew rite Mode Select Bit(1)

—

(b5-b4)

FMR00

FMSTP

b7 b6 b5 b4

FMR02

0 : CPU rew rite mode disabled

1 : CPU rew rite mode enabled

Reserved Bit

Set to “0”

0 : Completed successfully

1 : Terminated by error

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

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” and w riting

“1” to the FMSTP bit, the FMSTP bit is set to “1”. The flash memory does not enter low -pow er

consumption stat nor is reset.

FMR06

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

Set this bit to “1” immediately after setting this bit 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 in a space other than the flash memory.

Program Status Flag(4)

0 : Completed successfully

1 : Terminated by error

Erase Status Flag(4)

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