H8SLASH3028F datasheet(618/923 Pages) RENESAS

Part #	H8/3028F

Description	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

PDF	923 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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618 / 923 page

Rev. 2.00, 09/03, page 588 of 890

18.4.3

Flash Memory Emulation in RAM

In the H8/3028F-ZTAT, flash memory programming can be emulated in real time by overlapping

the flash memory with part of RAM (“overlap RAM”). When the emulation block set in RAMCR

is accessed while the emulation function is being executed, data written in the overlap RAM is

read.

Emulation should be performed in user mode or user program mode.

Application program

Execution state

Flash memory

Emulation block

RAM

SCI

Overlap RAM

(Emulation is performed on data written

in RAM)

Figure 18.3 Reading Overlap RAM Data in User Mode/User Program Mode

When overlap RAM data is confirmed, clear the RAMS bit to cancel RAM overlap, and actually

perform writes to the flash memory in user program mode.

When the programming control program is transferred to RAM in on-board programming mode,

ensure that the transfer destination and the overlap RAM do not overlap, as this will cause data in

the overlap RAM to be rewritten.

H8/3028F Datasheet(PDF) 618 Page - Renesas Technology Corp