R8CSLASH15 datasheet(216/277 Pages) RENESAS

216 / 277 page

R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 204 of 253

REJ09B0164-0210

Figure 18.10

Process to Reduce Power Consumption in On-Chip Oscillator Mode (Main Clock

Stops)

Transfer a on-chip oscillator mode (main clock stops)

program to any areas other the flash memory

Jump to the on-chip oscillator mode (main clock stops)

program which has been transferred to any areas other

the flash memory.

(The subsequent processing is executed by a program

in any areas other than the flash memory.)

Write “0” to the FMR01 bit before writing “1”

(CPU rewrite mode enabled)

Switch the clock source for the CPU clock.

Turn XIN off

Process in on-chip oscillator mode (main

clock stops)

Write “0” to the FMR01 bit

(CPU rewrite mode disabled)

Jump to a specified address in the flash memory

On-Chip Oscillator Mode

(Main Clock Stops) Program

NOTES :

1. Set the FMR01 bit to “1” (CPU rewrite mode) before setting the FMSTP bit to “1” .

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

3. Insert a 15us wait time in a program. Do not access to the flash memory during this wait time.

4. Ensure 10us until setting “0” (flash memory operates) after setting the FMSTP bit to “1” (flash memory stops).

Write “1” to the FMSTP bit (Flash memory

stops. Low power consumption state)(1)

Wait until the flash memory circuit stabilizes

(15ms)(3)

Write “0” to the FMSTP bit

(flash memory operation)(4)

Turn main clock on

→wait until oscillation

stabilizes

→switch the clock source for CPU

clock(2)

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