D17133CS datasheet(245/289 Pages) NEC

245 / 289 page

CHAPTER 18

INSTRUCTION SET

230

Stores the program memory contents, addressed by address register AR, to data buffer DBF.

Since this instruction temporarily uses one stack level, pay attention to nesting such as subroutines and

interrupts.

<3> Example

To transfer 16 bits of table data, specified by the values for address registers AR3, AR2, AR1, and AR0 in

the system register, to data buffers DBF3, DBF2, DBF1, and DBF0:

; *

; ** Table data

; *

Address

ORG

0010H

0000000000000000B ; (0000H)

0011H

1010101111001101B ; (0ABCDH)

; *

; ** Table reference program

; *

MOV

AR3, #00H

; AR3

← 00H

Sets 0011H in address register

MOV

AR2, #00H

; AR2

← 00H

MOV

AR1, #01H

; AR1

← 01H

MOV

AR0, #01H

; AR0

← 01H

MOVT DBF, @AR

; Transfers address 0011H data to DBF

In this case, the data are stored in DBF, as follows:

DBF3=0AH

DBF2=0BH

DBF1=0CH

DBF0=0DH

(7)

PUSH AR

Push address register

<1> OP code

00111

000

1101

0000

D17133CS Datasheet(PDF) 245 Page - NEC

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