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2.4 Instruction Details
1
2
3-141
Chapter 2 Instructions
Arithmetic flag
2009 No change
2010 Turns ON when the contents of the internal register is "0" after
"LDA #00000" is executed. Turns OFF at other times.
2011 No change
2012 Turns ON when the DM or relay indirectly addressed with #TM is
out of range.
"Indirect addressing" (p. 3-127)
Application of LDA and STA instructions
Changing the counter setting value
Coding
Description
In step
a), contents of DM00100 is transferred to C001 via the internal register for
use as the C001 preset value, when 0000 is ON.
In step b) , contents of #00200 is transferred to C001 via the internal register for
use as the C001 preset value, when 0002 is OFF.
Although the C001 preset value is #09999 in the above example, any value
except #00000 can be given because the preset value is changed to the speci-
fied value by turning ON/OFF 0000.
Note 1: If an STA instruction is executed when the current value is larger than the
preset value, the current value will be changed to the preset value.
Note 2: Do not specify "#00000" as the setting value for C001.
When 0000 is ON, #00100 is transferred as C001
preset value.
When 0000 is OFF, #00200 is transferred as C001
preset value.
When C001 current value equals to its preset value,
0500 turns ON.
0000
C001 0500
b)
#00100
LDA
C001
STA
0000
0002
#00200
LDA
C001
STA
#09999
C001
0001
a)
Line No. Instruction Operand
0000 LD 0000
0001 LDA #00100
0002 CON
0003 STA C001
0004 LDB 0000
0005 LDA #00200
0006 CON
0007 STA C001
0008 LD 0002
0009 C 001 #09999 0001
0010 CON
0011 AND C001
0012 OUT 0500
LDA / @LDA / STA @STA
KVNKA Chap 02_4cP.p65 08.3.11, 0:02 PM141
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