H8SSLASH2218 datasheet(625/750 Pages) RENESAS

Il numero della parte	H8S/2218

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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625 / 750 page

Section 17 Flash Memory (F-ZTAT Version)

Rev.6.00 Jun. 03, 2008 Page 577 of 698

REJ09B0074-0600

17.7

Flash Memory Emulation in RAM

Making a setting in the RAM emulation register (RAMER) enables part of RAM to be overlapped

onto the flash memory area so that data to be written to flash memory can be emulated in RAM in

real time. Emulation can be performed in user mode or user program mode. Figure 17.10 shows

an example of emulation of real-time flash memory programming.

1. Set RAMER to overlap part of RAM onto the area for which real-time programming is

required.

2. Emulation is performed using the overlapping RAM.

3. After the program data has been confirmed, the RAMS bit is cleared, thus releasing RAM

overlap.

4. The data written in the overlapping RAM is written into the flash memory space (EB0).

Start of emulation program

Set RAMER

Write tuning data to overlap

RAM

Execute application program

Tuning OK?

Clear RAMER

Write to flash memory

emulation block

End of emulation program

Yes

Figure 17.10 Flowchart for Flash Memory Emulation in RAM

H8S/2218 Scheda tecnica(PDF) 625 Page - Renesas Technology Corp