HD6433644R datasheet(156/549 Pages) RENESAS

156 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 136 of 526

REJ09B0326-0600

PREWRT:

MOV.B

#H'00,

R6L

;

Prewrite verify fail counter

MOV.W

#H'a,

;

Set prewrite loop counter

PREWRS:

INC

R6L

;

Prewrite-vector fail counter + 1

→ R6L

MOV.B

#H'00,

R1H

;

MOV.B

R1H,

@R3

;

Write H'00

MOV.W

#H'FE5A, R4

;

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 prewrite loop counter

BSET

#0,

@FLMCR:8

;

Set P bit

LOOPR1:

SUBS

#1,

;

MOV.W

R4,

;

BNE

LOOPR1

;

Wait loop

BCLR

#0,

@FLMCR:8

;

Clear P bit

MOV.B

#H'50,

R4L

;

MOV.B

R4L,

@TCSRW:8

;

Stop watchdog timer

MOV.B

#H'c,

R4H

;

Set prewrite-verify loop counter

LOOPR2:

DEC

R4H

;

BNE

LOOPR2

;

Wait loop

MOV.B

@R3,

R1H

;

Read data = H'00?

BEQ

PWVFOK

;

If read data = H'00, branch to PWVFOK

CMP.B

#H'06,

R6L

;

Prewrite-verify executed 6 times?

BEQ

ABEND1

;

If prewrite-verify executed 6 times, branch to ABEND1

ADD.W

R5,

;

Double the programming time

BRA

PREWRS

;

Prewrite again

ABEND1:

Write error

PWVFOK:

ADDS

#1,

;

Address + 1

→ R3

CMP.W

R2,

;

Last address?

BNE

PREWRT

;

If not last address, prewrite next address

;

Execute erase

HD6433644R Datasheet(PDF) 156 Page - Renesas Technology Corp

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