M16C6S_09 Datasheet, PDF (166/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
Flash Memory Version
• EW0 Mode
The microcomputer is placed in CPU rewrite mode by setting the FMR0 register’s FMR01 bit to “1” (CPU
rewrite mode enabled), ready to accept commands. In this case, because the FMR1 register’s FMR11 bit
= 0, EW0 mode is selected. The FMR01 bit can be set to “1” by writing “0” and then “1” in succession.
Use software commands to control program and erase operations. Read the FMR0 register or status
register to check the status of program or erase operation at completion.
• EW1 Mode
EW1 mode is selected by setting FMR11 bit to “1” (by writing “0” and then “1” in succession) after setting
the FMR01 bit to “1” (by writing “0” and then “1” in succession).
Read the FMR0 register to check the status of program or erase operation at completion. The status
register cannot be read during EW1 mode.
When an erase/program operation is initiated the CPU halts all program execution until the operation is
completed.
Rev.5.01 Dec 10, 2009 page 166 of 201
REJ03B0014-0501