H8SXSLASH1663M datasheet(1192/1504 Pages) RENESAS

1192 / 1504 page

Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1160 of 1468

REJ09B0412-0200

(3)

User MAT Erasing in User Boot Mode

Figure 25.17 shows the procedure for erasing the user MAT in user boot mode.

The difference between the erasing procedures in user program mode and user boot mode is the

memory MAT switching as shown in figure 25.17. For erasing the user MAT in user boot mode,

additional processing made by setting FMATS is required: switching from the user boot MAT to

the user MAT, and switching back to the user boot MAT after erasing completes.

Yes

Start erasing

procedure program

Set FKEY to H'A5

Yes

Download error processing

Set the FPEFEQ parameter

End erasing

procedure program

FPFR = 0 ?

Initialization error processing

Disable interrupts

and bus master operation

other than CPU

Clear FKEY to 0

Set FEBS parameter

Yes

Clear FKEY and erasing

error processing

Yes

Required

block erasing is

completed?

Set FKEY to H'A5

Clear FKEY to 0

Set FMATS to value other

than H'AA to select user MAT

Set SCO to 1 after initializing

VBR and execute download

Set FMATS to H'AA to

select user boot MAT

User-boot-MAT

selection state

Note:

The MAT must be switched by FMATS to perform the erasing error processing in the user boot MAT.

MAT

switchover

MAT

switchover

DPFR

= 0 ?

Initialization

JSR FTDAR setting

+ 32

Erasing

JSR FTDAR setting

+ 16

FPFR

= 0 ?

Select on-chip program

to be downloaded and

specify download

destination by FTDAR

Figure 25.17 Procedure for Erasing User MAT in User Boot Mode

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