HD6433644R datasheet(155/549 Pages) RENESAS

155 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 135 of 526

REJ09B0326-0600

Sample Program for Erasing One Block

This program uses the following registers:

R0:

Used for erase block specification. Also stores address used in prewrite and erase-verify.

R1H: Stores read data. Also used in dummy write.

R2:

Stores last address of block to be erased.

R3:

Stores address used in prewrite and erase-verify.

R4:

Used for prewrite, prewrite-verify, erase, and erase-verify loop counter value setting. Also

stores register set values.

R5:

Used for prewrite and erase loop counter value setting.

R6L: Used for prewrite-verify and erase-verify fail count.

The values of #a, #b, #c, #d, and #e in the program depend on the operating frequency. They

should be set as indicated in tables 6.11 and 6.12. Erase block register (EBR1, EBR2) settings

should be made as indicated in sections 6.5.2 and 6.5.3 in section 6.5, Flash Memory Register

Descriptions. For #BLKSTR and #BLKEND, the start address and end address corresponding to

the set erase block register should be set as indicated in table 6.7.

FLMCR:

.EQU

H'FF80

EBR1:

.EQU

H'FF82

EBR2:

.EQU

H'FF83

TCSRW:

.EQU

H'FFBE

TCW:

.EQU

H'FFBF

.ALIGN 2

MOV.B

#H'**,

R0H

;

MOV.B

R0H,

@EBR*:8

;

Set EBR*

; #

BLKSTR is start address of block to be erased

; #

BLKEND is last address of block to be erased

MOV.W

#BLKSTR, R0

;

Start address of block to be erased

MOV.W

#BLKEND, R2

;

Last address of block to be erased

ADDS

#1,

;

Last address of block to be erased + 1

→ R2

;

Execute prewrite

MOV.W

R0,

;

Start address of block to be erased

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