M16CSLASH29 datasheet(368/499 Pages) RENESAS

368 / 499 page

20. Flash Memory Version

page 344

Figure 20.10 Processing Before and After Low Power Dissipation Mode

Start main clock

oscillation

Transfer a low power internal consumption mode

program to RAM area

Switch the clock source of CPU clock.

Turn main clock off (2)

Jump to the low power consumption mode

program transferred to internal RAM area.

(In the following steps, use the low-power

consumption mode program or internal RAM area)

Wait until the flash memory circuit stabilizes (tps) (3)

Set the FMSTP bit to 0 (flash memory operation)

Set the FMSTP bit to 1 (flash memory stopped.

Low power consumption state)(1)

Process of low power consumption mode or

on-chip oscillator low power consumption mode

switch the clock source of the CPU clock (2)

Low power consumption

mode program

Set the FMR01 bit to 0

(CPU rewrite mode disabled)

Set the FMR01 bit to 1 after setting 0 (CPU

rewrite mode enabled) (2)

Jump to a desired address in the flash memory

wait until oscillation stabilizes

NOTES:

1. Set the FMRSTP bit to 1 after setting the FMR01 bit to 1 (CPU rewrite mode).

2. Wait until the clock stabilizes to switch the clock source of the CPU clock to the main clock or the sub clock.

3. Add a tps wait time by a program. Do not access the flash memory during this wait time.

M16C/29 Datasheet(PDF) 368 Page - Renesas Technology Corp