M32CSLASH86 datasheet(426/505 Pages) RENESAS

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Page 403

25. Flash Memory Version

)

(

Start main

clock

oscillation

Transfer the low-power consumption mode program

to a space other than the flash memory

Switch clock source of the CPU clock.

The main clock stops.(2)

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

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

Set the FMSTP bit to "1" (The flash memory stops

operating. It is in a low-power consumption state)(1)

Process in low-power consumption mode or

on-chip oscillator low-power consumption mode

Switch clock

source of the

CPU clock(2)

Low-power consumption

mode program

Set the FMR01 bit to "0"

(CPU rewrite mode disabled)(5)

Set the FMR01 bit to "1" after setting it to "0"

(CPU rewrite mode enabled)(4)

Jump to a desired address in the flash memory

Wait until

oscillation

stabilizes

Jump to the low-power consumption mode

program transferred to a space other than the

flash memory. (In the following steps, use the

low-power consumption mode program in a

space other than the flash memory.)

NOTES:

1. Set the FMSTP bit to "1" after the FMR01 bit is set to "1"

(CPU rewrite mode enabled).

2. Wait until clock stabilizes to switch a clock source of the

CPU clock to the main clock or sub clock.

3. Add tps ms wait time by program. Do not access the flash

memory during this wait time.

4. To set the FMR01 bit to "1", set it to "1" in 8-bit unit

immediately after setting it first to "0". Do not generate an

interrupt or a DMA transfer between setting the bit to "0"

and setting it to "1". Set the FMR01 bit while the NMI pin

is held "H".

5. To change the FMR01 bit setting from "1" to "0", enter

read array mode to write to addresses 005716 in 16-bit

unit. Write "0016" into 8 high-order bits.

Figure 25.8 Handling Before and After Low Power Consumption Mode

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