AH500 Programming Manual
6-23
API Instruction code
Operand
Function
0054 D
CMP P
S
1
, S
2
, D
Comparing the values
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
16-bit instruction (7 steps)
32-bit instruction (7 steps)
AH500 AH500 AH500
Symbol:
S
1
：
Comparison value 1 Word/Double word
S
2
：
Comparison value 2 Word/Double word
D
：
Comparison result Bit
Explanation:
1. The instruction is used to compare the value in S
1
with that in S
2
, and the values compared
are singed decimal numbers. The comparison results are stored in D.
2. The operand D occupies three consecutive devices. The comparison results are stored in D,
D+1, and D+2. If the comparison value in S
1
is greater than the comparison value in S
2
, D will
be ON. If the comparison value in S
1
is equal to the comparison value in S
2
, D+1 is ON. If the
comparison value in S
1
is less than the comparison value in S
2
, D+2 will be ON.
3. Only the instructions DCMP and DCMPP can use the 32-bit counter.
Example:
1. If the operand D is M0, the comparison results will be stored in M0, M1 and M2, as shown
below.
2. When X0.0 is ON, the instruction CMP is executed. M0, M1, or M2 is ON. When X0.0 is OFF,
the execution of the instruction CMP stops. The state of M0, the state of M1, and the state of
M1 remain unchanged
.
3. If users want to clear the comparison result, they can use the instruction RST or ZRST.
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