R8C2K datasheet(389/471 Pages) RENESAS

389 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 372 of 450

REJ09B0406-0110

• FMR40 Bit

The suspend function is enabled by setting the FMR40 bit to 1 (enabled).

• FMR41 Bit

In EW0 mode, the MCU enters erase-suspend mode when the FMR41 bit is set to 1 by a program. The FMR41

bit is automatically set to 1 (erase-suspend request) when an interrupt request of an enabled interrupt is

generated in EW1 mode, and then the MCU enters erase-suspend mode.

Set the FMR41 bit to 0 (erasure restarts) when the auto-erase operation restarts.

• FMR42 Bit

In EW0 mode, the MCU enters program-suspend mode when the FMR42 bit is set to 1 by a program. The

FMR42 bit is automatically set to 1 (program-suspend request) when an interrupt request of an enabled

interrupt is generated in EW1 mode, and then the MCU enters program-suspend mode.

Set the FMR42 bit to 0 (programming restarts) when the auto-program operation restarts.

• FMR43 Bit

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

remains set to 1 (erase execution in progress) during erase-suspend operation.

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). The

FMR44 bit remains set to 1 (program execution in progress) during program-suspend operation.

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 and set to 1 (reading

enabled) in suspend mode. 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.

R8C2K Datasheet(PDF) 389 Page - Renesas Technology Corp