Maxim-integrated MAX31782 Manual do Utilizador descarregar pdf (Página 173)

Maxim Integrated 19-8

MAX31782 User’s Guide

Revision 0; 8/11

For this example, assume that all 16 accumulator registers are initially set to zero.

move AP,#02h ;selectA[2]asactiveaccumulator

move APC,#02h ;auto-incrementAP[1:0]modulo4

    ; AP A[0] A[1] A[2] A[3]

    ; 02 0000 0000 0000 0000

add #01h  ; 03 0000 0000 0001 0000

add #02h  ; 00 0000 0000 0001 0002

add #03h  ; 01 0003 0000 0001 0002

add #04h  ; 02 0003 0004 0001 0002

add #05h  ; 03 0003 0004 0006 0002

19.5.3 ALU Operations Using the Active Accumulator and a Source

The following arithmetic and logical operations can use any register or immediate value as a source. The active accu-

mulator Acc is always used as the second operand and the implicit destination. Also, Acc may not be used as the

source for any of these operations.

add A[4]  ;Acc=Acc+A[4]

addc #32h

    ;Acc=Acc+0032h+Carry

sub A[15]  ;Acc=Acc–A[15]

subb A[1]  ;Acc=Acc–A[1]–Carry

cmp #00h

    ;If(Acc==0000h),setEqualsflag

and A[0]  ;Acc=AccANDA[0]

or #55h

    ; Acc=AccOR#0055h

xor A[1]  ; Acc=AccXORA[1]

19.5.4 ALU Operations Using Only the Active Accumulator

The following arithmetic and logical operations operate only on the active accumulator.

cpl   ;Acc=NOTAcc

neg   ;Acc=(NOTAcc)+1

rl   ;Rotateaccumulatorleft(notusingCarry)

rlc   ;RotateaccumulatorleftthroughCarry

rr   ;Rotateaccumulatorright(notusingCarry)

rrc   ;RotateaccumulatorrightthroughCarry

sla   ;Shiftaccumulatorleftarithmeticallyonce

sla2   ;Shiftaccumulatorleftarithmeticallytwice

sla4   ;Shiftaccumulatorleftarithmeticallyfourtimes

sr   ;Shiftaccumulatorright,setCarrytoAcc.0,

    ;setAcc.15tozero

sra   ;Shiftaccumulatorrightarithmeticallyonce

sra2   ;Shiftaccumulatorrightarithmeticallytwice

sra4   ;Shiftaccumulatorrightarithmeticallyfourtimes

xchn   ;SwaplowandhighnibblesofeachAccbyte

xch   ;SwaplowbyteandhighbyteofAcc

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MAX31782 User’s Guide 1

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