8051 Program - increment 16bit in iram

; Description:

; R0 Points To A 16 Bit Location To Increment. CY == 1 If Overflow.

;

; Entry Requirements:

; R0 Pointing To A 16 Bit Location In Internal RAM

;

; On Exit:

; CY Set Accordingly

;

; Affected:

; PSW.CY, PSW.Z, PSW.P, Acc

;

; Stack:

; 0 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; Might Be A Good Idea To Save The Accumulator

UTIL_INC16:
	inc r0	; Point To Low Byte
	mov a,@r0	; Get Low Byte
	add a,#1	; Add 1
	mov @r0,a	; Store Back
	dec r0	; Point To High Byte
	mov a,@r0	; Get High Byte
	addc a,#0	; Add CY, If Set
	mov @r0,a	; Store Back
	ret	; Return To Caller

Source: Assorted Utilities, John C. Wren 11/23/96

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List of topics: 8051

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