SUBCU ACC,loc16
6-346
Example 2
; Calculate signed: Quot16 = Num16Den16, Rem16 = Num16%Den16
CLRC TC ; Clear TC flag, used as sign flag
MOV ACC,@Den16 << 16 ; AH = Den16, AL = 0
ABSTC ACC ; Take abs value, TC = sign ^ TC
MOV T,@AH ; Temp save Den16 in T register
MOV ACC,@Num16 << 16 ; AH = Num16, AL = 0
ABSTC ACC ; Take abs value, TC = sign ^ TC
MOVU ACC,@AH ; AH = 0, AL = Num16
RPT #15 ; Repeat operation 16 times
||SUBCU ACC,@T ; Conditional subtract with Den16
MOV @Rem16,AH ; Store remainder in Rem16
MOV ACC,@AL << 16 ; AH = Quot16, AL = 0
NEGTC ACC ; Negate if TC = 1
MOV @Quot16,AH ; Store quotient in Quot16
Example 3
; Calculate unsigned: Quot32 = Num32/Den16, Rem16 = Num32%Den16
MOVU ACC,@Num32+1 ; AH = 0, AL = high 16-bits of Num32
RPT #15 ; Repeat operation 16 times
||SUBCU ACC,@Den16 ; Conditional subtract with Den16
MOV @Quot32+1,AL ; Store high 16-bit in Quot32
MOV AL,@Num32+0 ; AL = low 16-bits of Num32
RPT #15 ; Repeat operation 16 times
||SUBCU ACC,@Den16 ; Conditional subtract with Den16
MOV @Rem16,AH ; Store remainder in Rem16
MOV @Quot32+0,AL ; Store low 16-bit in Quot32
Example 4
; Calculate signed: Quot32 = Num32/Den16, Rem16 = Num32%Den16
CLRC TC ; Clear TC flag, used as sign flag
MOV ACC,@Den16 << 16 ; AH = Den16, AL = 0
ABSTC ACC ; Take abs value, TC = sign ^ TC
MOV T,@AH ; Temp save Den16 in T register
MOVL ACC,@Num32 ; ACC = Num32
ABSTC ACC ; Take abs value, TC = sign ^ TC
MOV P,@ACC ; P = Num32
MOVU ACC,@PH ; AH = 0, AL = high 16-bits of Num32
RPT #15 ; Repeat operation 16 times
||SUBCU ACC,@T ; Conditional subtract with Den16
MOV @Quot32+1,AL ; Store high 16-bit in Quot32
MOV AL,@PL ; AL = low 16-bits of Num32
RPT #15 ; Repeat operation 16 times
||SUBCU ACC,@T ; Conditional subtract with Den16
MOV @Rem16,AH ; Store remainder in Rem16
MOV ACC,@AL << 16 ; AH = low 16-bits of Quot32, AL = 0
NEGTC ACC ; Negate if TC = 1
MOV @Quot32+0,AH ; Store low 16-bit in Quot32
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