M16C6S_09 Datasheet, PDF (169/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
Flash Memory Version
EW0 mode operation procedure
Single-chip mode
Rewrite control program
Set the FMR01 bit by writing “0” and then “1”
(CPU rewrite mode enabled) (Note 2)
Set CM0, CM1, and PM1 registers (Note1)
Execute software commands
Transfer a CPU rewrite mode based rewrite control
program to any area other than the flash memory
Jump to the rewrite control program which has been
transferred to any area other than the flash memory
(The subsequent processing is executed by the
rewrite control program in any area other than the
flash memory)
Execute the Read Array command
Write “0” to the FMR01 bit
(CPU rewrite mode disabled)
Jump to a specified address in the flash memory
Note 1: Select 10 MHz or less for CPU clock using the CM0 register’s CM06 bit and CM1 register’s CM17 to 6
bits. Also, set the PM1 register’s PM17 bit to “1” (with wait state).
Note 2: To set the FMR01 bit to “1”, write “0” and then “1” in succession. Make sure no interrupts or no DMA
transfers will occur before writing “1” after writing “0”.
Write to the FMR01 bit from a program in other than the flash memory.
Note 3: Disables the CPU rewrite mode after executing the Read Array command.
Figure 1.21.2. Setting and Resetting of EW0 Mode
Rev.5.01 Dec 10, 2009 page 169 of 201
REJ03B0014-0501