8051 Program - compare dptr to ba

; Description:

; Compare DPTR To AB. Return CY == 1 If DPTR > BA, Else CY == 0 If

; DPTR <= BA. The Operation Is BA - DPTR.

;

; Entry Requirements:

; B/Acc With Value To Be Compared Against

; DPTR Containing Value To Compare

;

; 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_UCMPDPTRBA:
	clr c	; Clear For Subtract
	subb a,dpl	; Subtract DPL
	mov a,b	; Get High Byte
	subb a,dph	; Subtract DPH
	ret	; Return To Caller

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

---

<< Previous :: Up :: Next >>

---

Related topics:
8051 Program - increment 16bit in iram   |   8051 Program - compare dptr to 16bit iram value   |   8051 Program - shift a 16 bit iram value 4 bits left   |   8051 Program - load dptr from (dptr) rom   |   8051 Program - load dptr from (dptr) xram   |   8051 Program - store r6r7 to dptr xram   |   8051 Program - exchange r0r1 and dptr   |   8051 Program - exchange r6r7 and dptr   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

---

List of topics: 8051

---