INSTRUCTION DESCRIPTIONS
MOTOROLA INSTRUCTION SET DETAILS A - 277
Condition Codes:
S — Computed according to the definition in A.5 CONDITION CODE COMPUTATION
L — Set if limiting (parallel move) or overflow has occurred in result
E — Set if the signed integer portion of A or B result is in use
U — Set if A or B result is unnormalized
N — Set if bit 55 of A or B result is set
Z — Set if A or B result equals zero
V — Set if overflow has occurred in A or B result
C — Set if a carry (or borrow) occurs from bit 55 of A or B result
Note: The definitions of the E and U bits vary according to the scaling mode being used.
Refer to Section A.5 CONDITION CODE COMPUTATION for complete details.
Instruction Format:
SUB S,D
Opcode:
Instruction Fields:
S,D J J J d S,D J J J d S,D J J J d
B,A 0 0 1 0 X0,A 1 0 0 0 Y1,A 1 1 1 0
A,B 0 0 1 1 X0,B 1 0 0 1 Y1,B 1 1 1 1
X,A 0 1 0 0 Y0,A 1 0 1 0
X,B 0 1 0 1 Y0,B 1 0 1 1
Y,A 0 1 1 0 X1,A 1 1 0 0
Y,B 0 1 1 1 X1,B 1 1 0 1
Timing: 2+mv oscillator clock cycles
Memory: 1+mv program words
SUB Subtract SUB
MR CCR
1514131211109876543210
LF DM T ** S1 S0 I1 I0 SLEUNZVC
23 8 7 4 3 0
DATA BUS MOVE FIELD 0JJJd100
OPTIONAL EFFECTIVE ADDRESS EXTENSION