M16CSLASH1N datasheet(195/238 Pages) RENESAS

195 / 238 page

Rev.1.00

Oct 20, 2004

page 183 of 222

M16C/1N Group

19. Flash Memory Version

REJ09B0007-0100Z

Execute the read array command (Note 3)

Single-chip mode

Set CM0, CM1, and PM1 registers (Note 1)

Execute software commands

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)

Transfer a CPU rewrite mode based rewrite control

program to any area other than the flash memory

Write "0" to the FMR01 bit

(CPU rewrite mode disabled)

Set the FMR01 bit by writing "0" and then "1"

(CPU rewrite mode enabled) (Note 2)

For only boot mode

Set the FMR05 bit to "1"

(User ROM area access)

EW0 mode operation procedure

Rewrite control program

Jump to a specified address in the flash memory

For only boot mode

Write "0" to the FMR05 bit

(Boot ROM area accessed) (Note 4)

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 will occur before

writing "1" after writing "0".

Write to the FMR01 bit by a program in a memory area other than the flash memory.

Note 3: Disables the CPU rewrite mode after executing the read array command.

Note 4: User ROM area is accessed when the FMR05 bit is set to "1".

Figure 19.6 Setting and resetting of EW0 mode

Figure 19.6 and 19.7 show the setting and resetting of EW0 mode and EW1 mode, respectively. Figure

19.8 shows the processing before and after low power dissipation mode.

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