Operation:
Destination - Source -->; cc
Compatibility: 68000 Family
Assembler Syntax:
CMP <ea>, Dn
Attributes: Size = (Byte, Word, Long)
Description: Subtracts the source operand from the destination
data register and sets the condition codes according to the
result; the data register is not changed. The size of the operation
can be byte, word, or long.
Condition Codes:
\c32222
X Not affected.
N Set if the result is negative. Cleared otherwise.
Z Set if the result is zero. Cleared otherwise.
V Set if an overflow occurs. Cleared otherwise.
C Set if a borrow occurs. Cleared otherwise.
Instruction Format:
\i1+-++3Reg,3Opmode,u6Effective Address,3Mode,3Reg,
Instruction Fields:
Register field -- Specifies the destination data register.
Opmode field:
Byte\b \bWord\b \bLong\b \bOperation
000 001 010 (<Dn>)-(<ea>)
Effective Address field -- Determines the source operand. All
addressing modes are allowed as shown:
\mFFF
Note: CMPA is used when the destination is an address register. CMPI
is used when the source is immediate data. The assembler will
automatically makes these substitution.
Related Instructions:
CMPA,434
CMPI,435
CMPM,436
CMP2,437
CMP A,B signed unsigned ------- ------ -------- B <; A BLT BLO (or BCS) B <;= A BLE BLS B = A BEQ BEQ B <;>; A BNE BNE B >; A BGT BHI B >;= A BGE BHS (or BCC) TST A signed unsigned ------- ------ -------- A <; 0 BLT (or BMI) NOP A <;= 0 BLE BZ (or BEQ) A = 0 BZ (or BEQ) BZ (or BEQ) A <;>; 0 BNZ (or BNE) BNZ (or BNE) A >; 0 BGT BNZ (or BNE) A >;= 0 BGE (or BPL) BRA.432434