HD6433644R datasheet(162/549 Pages) RENESAS

162 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 142 of 526

REJ09B0326-0600

MOV.W

@R2+,

;

Dummy-increment R2

BRA

PRETST

;

; Execute prewrite

PREWRT:

MOV.W

@R2+,

;

Prewrite start address

PREW:

MOV.B

#H'00,

R6L

;

Prewrite-verify fail counter

MOV.W

#H'a,

;

Set prewrite loop counter

PREWRS:

INC

R6L

;

Prewrite-verify fail counter + 1

→ R6H

MOV.B

#H'00

R1H

;

MOV.B

R1H,

@R3

;

Write H'00

MOV.W

#H'FE5A,

;

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'b,

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

MOV.W

@R2,

;

Start address of next block

CMP.W

R4,

;

Last address?

BNE

PREW

;

If not last address, prewrite next address

PWADD2:

INC

R1L

;

Used to test bit R1L +1 in R0

BRA

PRETST

;

Branch to PRETST

;

Execute erase

ERASES:

MOV.W

#H'0000,

;

Erase-verify fail counter

MOV.W

#H'd,

;

Set erase loop counter

ERASE:

ADDS

#1,

;

Erase-verify fail counter + 1

→ R6

HD6433644R Datasheet(PDF) 162 Page - Renesas Technology Corp

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