HD6433644R datasheet(157/549 Pages) RENESAS

157 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 137 of 526

REJ09B0326-0600

ERASES:

MOV.W

#H'0000, R6

;

Erase-verify fail counter

MOV.W

#H'd,

;

Set erase loop counter

ERASE:

ADDS

#1,

;

Erase-verify fail counter + 1

→ R6

MOV.W

#H'e5A,

;

MOV.B

R4L,

@TCSRW:8

;

MOV.B

R4H,

@TCW:8

;

MOV.B

#H'36,

R4L

;

MOV.B

R4L,

@TCSRW:8

;

Start watchdog timer

MOV.W

R5,

;

Set erase loop counter

BSET

#1,

@FLMCR:8

;

Set E bit

LOOPE:

NOP

SUBS

#1,

;

MOV.W

R4,

;

BNE

LOOPE

;

Wait loop

BCLR

#1,

@FLMCR:8

;

Clear E bit

MOV.B

#H'50,

R4L

;

MOV.B

R4L,

@TCSRW:8

;

Stop watchdog timer

;

Execute erase-verify

MOV.W

R0,

;

Start address of block to be erased

MOV.B

#H'b,

R4H

;

Set erase-verify loop counter

BSET

#3,

@FLMCR:8

;

Set EV bit

LOOPEV:

DEC

R4H

;

BNE

LOOPEV

;

Wait loop

EVR2:

MOV.B

#H'FF,

R1H

;

MOV.B

R1H,

@R3

;

Dummy write

MOV.B

#H'c,

R4H

;

Set erase-verify loop counter

LOOPDW:

DEC

R4H

;

BNE

LOOPDW

;

Wait loop

MOV.B

@R3+,

R1H

;

Read

CMP.B

#H'FF,

R1H

;

Read data = H'FF?

BNE

RERASE

;

If read data ≠ H'FF, branch to RERASE

HD6433644R Datasheet(PDF) 157 Page - Renesas Technology Corp

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