Intel mcs-48 manual INC a Increment Accumulator, INC Rr Increment Register

INSTRUCTION SET

Example: INP12: IN A,P1	;INPUT PORT 1 CONTENTS
	;TO ACC
MOV R6,A	;MOVE ACC CONTENTS TO
	;REG 6
IN A,P2	;INPUT PORT 2 CONTENTS
	;TO ACC
MOV R7,A	;MOVE ACC CONTENTS TO REG 7

INC A Increment Accumulator

10001101111

The contents of the accumulator are incremented by one.

(A)-- (A)+1

Example: Increment contents of location 100 in external data memory.

INCA: MOV RO,#100 ;MOVE '100'DEC TO ADDRESS

;REG 0

MOVX A,@RO ;MOVE CONTENTS OF LOCATION ;100 TO ACC

INC A;INCREMENT A

MOVX @RO,A ;MOVE ACC CONTENTS TO ;LOCATION 100

INC Rr Increment Register

1000111rrri

The contents of working register Or' are incremented by one.

(Rr)-- (Rr)+1r=0-7

Example: INCRO: INC RO ;INCREMENT ADDRESS REG 0

INC @R r Increment Data Memory Location

100011000ri

The contents of the resident data memory location addressed by register Or' bits 0-5*are incremented by one.

((Rr))-- ((Rr))+1	r=0-1
Example: INCDM: MOV R1,#03FH	;MOVE ONES TO REG 1
INC @R1	;INCREMENT LOCATION 63

Mnemonics copyright Intel Corporation 1976. '0-6 .Ior 8039/8049

4-17