IDEC MicroSmart - Manual (Page 231)

10: D ATA C OMPARISON I NSTRUCTIONS
« FC4A M ICRO S MART U SER ’ S M ANUAL » 10-3
Repeat Operation in the Data Comparison Instructions
The following examples are described using the CMP
≥ instruction of the word data type. Repeat operation for all other
data comparison instructions and the integer data type is the same for the following examples.
Repeat One Source Operand
When only S1 (source) is designated to repeat, source operands (as many as the repeat cycles, starting with the operand
designated by S1) are compared with the operand designated by S2. The comparison results are ANDed and set to the des-
tination operand designated by D1.
Repeat Two Source Operands
When S1 (source) and S2 (source) are designated to repeat, source operands (as many as the repeat cycles, starting with
the operands designated by S1 and S2) are compared with each other. The comparison results are ANDed and set to the
destination operand designated by D1.
Repeat Source and Destination Operands
When S1, S2 (source), and D1 (destination) are designated to repeat, source operands (as many as the repeat cycles, start-
ing with the operands designated by S1 and S2) are compared with each other. The comparison results are set to destina-
tion operands (as many as the repeat cycles, starting with the operand designated by D1).
Comparison Output Status
The comparison output is usually maintained while the input to the data comparison instruction is off. If the comparison
output is on, the on status is maintained when the input is turned off as demonstrated by this program.
This program turns the output off when the input is off.
I0
REP
3
S1 R
D10
D1 –
M10 CMP>=(W) S2 –
15
AND 15 D11
10 D10
20 D12
M10
S1 (Repeat = 3) D1 (Repeat = 0) S2 (Repeat = 0)
15
15
15
AND M10
I0
REP
3
S1 R
D10
D1 –
M10 CMP>=(W) S2 R
D20
20 D21
0 D20
100 D22
S2 (Repeat = 3) D1 (Repeat = 0)
20 D11
10 D10
30 D12
S1 (Repeat = 3)
I0
REP
3
S1 R
D10
D1 R
M10
CMP>=(W) S2 R
D20
20 D21
0 D20
100 D22
M11 turned on
M10 turned on
M12 turned off
S2 (Repeat = 3) D1 (Repeat = 3)
20 D11
10 D10
30 D12
S1 (Repeat = 3)
Input I0
ON
OFF
Comparison D10 ≥ C1
D10 < C1
Comparison ON
OFF
I0
REP S1 –
D10
D1 –
Q0
CMP>=(W)
Result
Output Q0
S2 –
C1
I0
M0
REP S1 –
D10
D1 –
M0
S2 –
C1
Input I0
ON
OFF
Comparison D10 ≥ C1
D10 < C1
ON
OFF
Result
Output Q0
CMP>=(W)
Q0