HT46R46 datasheet(14/77 Pages) HOLTEK

14 / 77 page

HT46R46/C46/R47/C47/R48A/C48A/R49

Rev. 1.30

June 5, 2008

The following example shows how to clear a section of four RAM locations already defined as locations adres1 to

adres4.

data .section

¢data¢

adres1

db ?

adres2

db ?

adres3

db ?

adres4

db ?

block

db ?

code .section at 0

¢code¢

org

00h

start:

mov

a,04h

; setup size of block

mov

block,a

mov

a,offset adres1

; Accumulator loaded with first RAM address

mov

mp,a

; setup memory pointer with first RAM address

loop:

clr

IAR

; clear the data at address defined by MP

inc

; increment memory pointer

sdz

block

; check if last memory location has been cleared

jmp

loop

continue:

The important point to note here is that in the example shown above, no reference is made to specific RAM addresses.

0 0 H

0 1 H

0 2 H

0 3 H

0 4 H

0 5 H

0 6 H

0 7 H

0 8 H

0 9 H

0 A H

0 B H

0 C H

0 D H

0 E H

0 F H

1 0 H

1 1 H

1 2 H

1 3 H

1 4 H

1 5 H

1 6 H

1 7 H

1 8 H

1 9 H

1 A H

1 B H

1 C H

1 D H

1 E H

1 F H

2 0 H

2 1 H

2 2 H

2 3 H

: U n u s e d , r e a d a s " 0 0 "

I A R

M P

A C C

P C L

T B L P

T B L H

S T A T U S

I N T C

T M R

T M R C

P A

P A C

P B

P B C

P D

P D C

P W M

A D R

A D C R

A C S R

H T 4 6 R 4 6

I A R

M P

A C C

P C L

T B L P

T B L H

S T A T U S

I N T C

T M R

T M R C

P A

P A C

P B

P B C

P D

P D C

P W M

A D R L

A D R H

A D C R

A C S R

H T 4 6 R 4 7

I A R

M P

A C C

P C L

T B L P

T B L H

S T A T U S

I N T C

T M R

T M R C

P A

P A C

P B

P B C

P C

P C C

P D

P D C

P W M

A D R L

A D R H

A D C R

A C S R

H T 4 6 R 4 8 A

I A R

M P

A C C

P C L

T B L P

T B L H

S T A T U S

I N T C

T M R

T M R C

P A

P A C

P B

P B C

P C

P C C

P D

P D C

P W M 0

P W M 1

A D R L

A D R H

A D C R

A C S R

H T 4 6 R 4 9

Special Purpose Data Memory

HT46R46 Datasheet(PDF) 14 Page - Holtek Semiconductor Inc

HT46R46 Datasheet(HTML) 14 Page - Holtek Semiconductor Inc

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