Maxim Integrated MAXQ7667 - Manual (Page 36)

3-9 ___________________________________________________________________________________________________________
MAXQ7667 User’s Guide
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 accumulator 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]
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 four times
sr ; Shift accumulator right, set Carry to Acc.0,
; set Acc.15 to zero (MAXQ20)
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 (MAXQ20 only) ; Swap low byte and high byte of Acc
3.5.5 ALU Bit Operations Using Only the Active Accumulator
The following operations operate on single bits of the current active accumulator in conjunction with the Carry flag. Any of these oper-
ations may use an Acc bit from 0 to 15.
move C, Acc.0 ; copy bit 0 of accumulator to Carry
move Acc.5, C ; copy Carry to bit 5 of accumulator
and Acc.3 ; Acc.3 = Acc.3 AND Carry
or Acc.0 ; Acc.0 = Acc.0 OR Carry
xor Acc.1 ; Acc.1 = Acc.1 OR Carry
None of the above bit operations cause the autoincrement, autodecrement, or modulo operations defined by the accumulator pointer
control (APC) register.