R8CSLASH2G datasheet(270/344 Pages) RENESAS

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R8C/2G Group

20. Flash Memory

Rev.1.00

Apr 04, 2008

Page 250 of 318

REJ09B0387-0100

• FMR00 Bit

This bit indicates the operating status of the flash memory. The bits value is 0 during programming,

erasure, or erase-suspend mode; otherwise, it is 1.

• FMR01 Bit

The MCU is made ready to accept commands by setting the FMR01 bit to 1 (CPU rewrite mode).

• FMR02 Bit

Rewriting of blocks 0 and 1 does not accept program or block erase commands if the FMR02 bit is set to 0

(rewrite disabled).

Rewriting of blocks 0 and 1 is controlled by bits FMR15 and FMR16 if the FMR02 bit is set to 1 (rewrite

enabled).

• FMSTP Bit

This bit is used to initialize the flash memory control circuits, and also to reduce the amount of current

consumed by the flash memory. Access to the flash memory is disabled by setting the FMSTP bit to 1.

Therefore, the FMSTP bit must be written to by a program transferred to the RAM.

In the following cases, set the FMSTP bit to 1:

- When flash memory access resulted in an error while erasing or programming in EW0 mode (FMR00 bit

not reset to 1 (ready))

- To provide lower consumption in low-speed on-chip oscillator mode and low-speed clock mode.

Note that when going to stop or wait mode while the CPU rewrite mode is disabled, the FMR0 register

does not need to be set because the power for the flash memory is automatically turned off and is turned

back on again after returning from stop or wait mode.

• FMR06 Bit

This is a read-only bit indicating the status of an auto-program operation. The bit is set to 1 when a

program error occurs; otherwise, it is set to 0. For details, refer to the description in Table 20.4 Errors and

FMR0 Register Status.

• FMR07 Bit

This is a read-only bit indicating the status of an auto-erase operation. The bit is set to 1 when an erase

error occurs; otherwise, it is set to 0. Refer to Table 20.4 Errors and FMR0 Register Status for details.

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