HD6433644R datasheet(161/549 Pages) RENESAS

161 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 141 of 526

REJ09B0326-0600

Notes: 1. In this sample program, the stack pointer (SP) is set to address H'FF80. On-chip RAM

addresses H'FF7E and H'FF7F are used as a stack area. Therefore addresses H'FF7E

and H'FF7F should not be used when this program is executed, and on-chip RAM

should not be disabled.

2. It is assumed that this program, written in the ROM area, is transferred to the RAM

area and executed there. For #RAMSTR in the program, substitute the start address of

the RAM area to which the program is transferred. The value set for #RAMSTR must

be an even number.

FLMCR:

.EQU

H'FF80

EBR1:

.EQU

H'FF82

EBR2:

.EQU

H'FF83

TCSRW:

.EQU

H'FFBE

TCW:

.EQU

H'FFBF

STACK:

.EQU

H'FF80

.ALIGN 2

START:

MOV.W

#STACK,

;

Set stack pointer

;

Set R0 value as explained on previous page. This sample program erases

;

all blocks.

MOV.W

#H'0FFF,

;

Select blocks to be erased (R0: EBR1/EBR2)

MOV.B

R0H,

@EBR1

;

Set EBR1

MOV.B

R0L,

@EBR2

;

Set EBR2

;

#RAMSTR is start address of RAM area to which program is transferred

;

Set #RAMSTR to even number

MOV.W

#RAMSTR, R2

;

Transfer destination start address (RAM)

MOV.W

#ERVADR, R3

;

ADD.W

R3,

;

#RAMSTR + #ERVADR

→ R2

MOV.W

#START,

;

SUB.W

R3,

;

Address of data area used in RAM

MOV.B

#H'00,

R1L

;

Used to test bit R1L in R0

PRETST:

CMP.B

#H'0C,

R1L

;

R1L = H'0C?

BEQ

ERASES

;

If finished checking all R0 bits, branch to ERASES

CMP.B

#H'08,

R1L

;

BMI

EBR2PW

;

If R1L ≥ 8, EBR1 test; if R1L < 8, EBR2 test

MOV.B

R1L,

R1H

;

SUBX

#H'08,

R1H

;

R1L – 8

→ R1H

BTST

R1H,

R0H

;

Test bit R1H in EBR1 (R0H)

BNE

PREWRT

;

If bit R1H in EBR1 (R0H) is 1, branch to PREWRT

BRA

PWADD1

;

If bit R1H in EBR1 (R0H) is 0, branch to PWADD1

EBR2PW:

BTST

R1L,

R0L

;

Test bit R1L in EBR2 (R0L)

BNE

PREWRT

;

If bit R1L in EBR2 (R0L) is 1, branch to PREWRT

PWADD1:

INC

R1L

;

R1L + 1

→ R1L

HD6433644R Datasheet(PDF) 161 Page - Renesas Technology Corp

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