M16CSLASH26 datasheet(200/239 Pages) RENESAS

200 / 239 page

Renesas Technology Corp.

CPU Rewrite Mode (Flash Memory Version)

194

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.20.2c. Shifting to the low power dissipation mode flowchart

End

Start

XIN oscillating

Transfer the program to be executed in the low

power dissipation mode, to the internal RAM.

Switch the count source of BCLK.

XIN stop. (Note 2)

Jump to transferred control program in RAM

(Subsequent operations are executed by control

program in this RAM)

Note 1: For flash memory reset bit to be set to 1 , the user needs to write a 0 and then a 1 to it in succession.

When it is not this procedure, it is not enacted in 1 . This is necessary to ensure that no interrupt or DMA

transfer will be executed during the interval.

Note 2: Before the count source for BCLK can be changed from XIN to XCIN or vice versa, the clock to which

the count source is going to be switched must be oscillating stably.

Note 3: Make a waiting time for 10

µs by software.

In this waiting time, do not access flash memory.

Wait time until the internal circuit stabilizes (10

µs)

(Note 3)

Set flash memory reset bit to 0

Set flash memory reset bit to 1

(by writing 0 and then 1 in succession)(Note 1)

Program in ROM

Program in RAM

Process of low power dissipation mode

Wait until the XIN has stabilized

Switch the count source of BCLK (Note 2)

Set CPU rewrite mode select bit to 1

(by writing 0 and then 1 in succession)

Set CPU rewrite mode select bit to 0

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