M16C6S_09 Datasheet, PDF (167/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
Flash Memory Version
Figure 1.21.1 shows the FMR0 and FMR1 registers.
FMR00 Bit
This bit indicates the operating status of the flash memory. The bit is “0” when the Program or Erase is
running; otherwise, the bit is “1”.
FMR01 Bit
The microcomputer is made ready to accept commands by setting the FMR01 bit to “1” (CPU rewrite
mode).
FMR02 Bit
When FMR02 bit is “0” (rewriting is disable), block 0 and block 1 do not receive the command of a
program and block erase.
FMSTP Bit
This bit is provided for initializing the flash memory control circuits, as well as for reducing the amount of
current consumed in the flash memory. The internal flash memory is disabled against access by setting
the FMSTP bit to “1”. Therefore, the FMSTP bit must be written to by a program in other than the flash
memory.
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))
FMR06 Bit
This is a read-only bit indicating the status of auto program operation. The bit is set to “1” when a program
error occurs; otherwise, it is cleared to “0”. For details, refer to the description of the full status check.
FMR07 Bit
This is a read-only bit indicating the status of auto erase operation. The bit is set to “1” when an erase
error occurs; otherwise, it is cleared to “0”. For details, refer to the description of the full status check.
Figure 1.21.2 and 1.21.3 show the setting and resetting of EW0 mode and EW1 mode, respectively.
FMR11 Bit
Setting this bit to “1” places the microcomputer in EW1 mode.
Rev.5.01 Dec 10, 2009 page 167 of 201
REJ03B0014-0501