H8SXSLASH1663 datasheet(972/1158 Pages) RENESAS

972 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 920 of 1102

REJ09B0294-0100

(4) Procedure of Erasing, Programming, and RAM Emulation in User Program Mode

By changing the on-chip RAM start address of the download destination in FTDAR, the erasing

program and programming program can be downloaded to separate on-chip RAM areas.

Figure 21.15 shows a repeating procedure of erasing, programming, and RAM emulation.

Start procedure

program

Set FTDAR to H'00

(specify download

destination to H'FF9000)

Yes

Initialize erasing program

Set FTDAR to H'02

(specify download

destination H'FFB000)

Download programming program

Initialize programming program

End procedure

program

Erase relevant block

(execute erasing program)

Set FMPDR to H'FFA000

and program relevant block

(execute programming program)

Confirm operation

End ?

Download erasing program

Exit emulation mode

Make a transition to RAM

emulation mode and tuning

parameters in on-chip RAM

Figure 21.15 Repeating Procedure of Erasing, Programming,

and RAM Emulation in User Program Mode

In Figure 21.15, since RAM emulation is performed, the erasing/programming program is

downloaded to avoid the 4-kbyte on-chip RAM area (H'FFA000 to H'FFAFFF). Download and

initialization are performed only once at the beginning. Note the following when executing the

procedure program.

• Be careful not to overwrite data in the on-chip RAM with overlay settings. In addition to the

programming program area, erasing program area, and RAM emulation area, areas for the

procedure programs, work area, and stack area are reserved in the on-chip RAM. Do not make

settings that will overwrite data in these areas.

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