Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 45)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 3-9

• Increment modulo 8: AP = AP[3] + ((AP[2:0] + 1) mod 8)

• Decrement modulo 8: AP = AP[3] + ((AP[2:0] - 1) mod 8)

• Increment modulo 16: AP = (AP + 1) mod 16

• Decrement modulo 16: AP = (AP - 1) mod 16

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

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

mov 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

3.5.3 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 cannot 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]

3.5.4 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 4 times

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

; set Acc.15 to zero

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 254 255

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Maxim-integrated MAXQ622 Manual do Utilizador Página 45