M16CSLASH1N datasheet(197/238 Pages) RENESAS

197 / 238 page

Rev.1.00

Oct 20, 2004

page 185 of 222

M16C/1N Group

19. Flash Memory Version

REJ09B0007-0100Z

Figure 19.8 Processing before and after low power dissipation mode

Turn XIN on

Transfer a low power dissipation mode program

to any area other than the flash memory

Switch the clock source for CPU clock.

Turn XIN off. (Note 2)

Jump to the low power dissipation mode program

which has been transferred to any area other than

the flash memory.

(The subsequent processing is executed by a

program in any area other than the flash memory.)

Wait until the flash memory circuit stabilizes

(10

µs) (Note 3)

Set the FMSTP bit to "0" (flash memory operation)

Set FMSTP bit to "1"

(flash memory stopped. Low power state) (Note 1)

Process of low power dissipation mode or

on-chip oscillator low power dissipation mode

switch the clock source for CPU clock (Note 2)

Low power dissipation

mode program

Write "0" to the FMR01 bit

(CPU rewrite mode disabled)

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

(CPU rewrite mode enabled)

Jump to a specified address in the flash memory

wait until oscillation stabilizes

Note 1: Set the FMSTP bit to "1" after setting the FMR01 bit to "1".

Note 2: Before the clock source for CPU clock can be changed, the clock to which to be changed must be stable.

Note 3: Insert a 10

µs wait time in a program. The flash memory cannot be accessed during this wait time.

M16C/1N Datasheet(PDF) 197 Page - Renesas Technology Corp