D17133CS datasheet(216/289 Pages) NEC

216 / 289 page

CHAPTER 18

INSTRUCTION SET

201

INC

; Increments address register by 1

LOOP

<4> Note

The higher 6 bits of address register are fixed to 0. Only lower 10 bits can be used.

(6)

INC IX

Increment index register

<1> OP code

00111

000

1000

0000

<2> Function

← IX + 1

Increments the index register IX contents.

<3> Example 1

Adds 1 to the total of 12-bit contents for IXH, IXM, and IXL (index registers) in the system register and stores

the result in IXH, IXM, and IXL;

;

IXL

← IXL + 1

;

IXM

← IXM + CY

;

IXH

← IXH + CY

INC IX

This program can be rewritten as follows, with addition instructions:

ADD

IXL, #01H

ADDC IXM, #00H

ADDC IXH, #00H

Example 2

Clears all the contents for data memory addresses 0.00H through 0.73H to 0, using the index register:

MOV

IXH, #00H

; Sets index register contents in 00H in bank 0

MOV

IXM, #00H

MOV

IXL, #00H

RAM clear:

MEM000

MEM

0.00H

SET1

IXE

; IXE flag

← 1

D17133CS Datasheet(PDF) 216 Page - NEC

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