M16C1N Datasheet, PDF (197/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
19. Flash Memory Version
Transfer a low power dissipation mode program
to any area other than the flash memory
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.)
Low power dissipation
mode program
Set the FMR01 bit by writing "0" and then "1"
(CPU rewrite mode enabled)
Set FMSTP bit to "1"
(flash memory stopped. Low power state) (Note 1)
Switch the clock source for CPU clock.
Turn XIN off. (Note 2)
Process of low power dissipation mode or
on-chip oscillator low power dissipation mode
Turn XIN on wait until oscillation stabilizes
switch the clock source for CPU clock (Note 2)
Set the FMSTP bit to "0" (flash memory operation)
Write "0" to the FMR01 bit
(CPU rewrite mode disabled)
Wait until the flash memory circuit stabilizes
(10 µs) (Note 3)
Jump to a specified address in the flash memory
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.
Figure 19.8 Processing before and after low power dissipation mode
Rev.1.00 Oct 20, 2004 page 185 of 222
REJ09B0007-0100Z