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2 Instruction Descriptions
NJ-series Instructions Reference Manual (W502)
Shift Instructions
2
NSHLC and NSHRC
These instructions shift Size array elements in shift register array InOut[] by the number of bits specified
in Num. The shift register starts at InOut[0]. The last bit that is shifted out of the register is output to the
Carry (CY) Flag. Zeros are inserted for the bits at the other end.
z NSHLC
The NSHLC instruction shifts bits from the lower elements in the array to the higher elements and from
the least-significant bits to the most-significant bits.
z NSHRC
The NSHRC instruction shifts bits from the higher elements in the array to the lower elements and from
the most-significant bits to the least-significant bits.
The following example shows the NSHLC instruction when InOut[] is a BYTE array, Size is USINT#80
and Num is USINT#3.
• The shift operation is not performed if the value of Num is 0.
• If the value of Num is larger than Size, Size bits from bit 0 of InOut[0] are changed to FALSE. The
value of the Carry Flag (CY) changes to FALSE.
• Return value Out is not used when the instruction is used in ST.
• An error occurs in the following case. ENO will be FALSE, and InOut[] will not change.
• The value of Size exceeds the array area of InOut[].
Function
Related System-defined Variables
Name Meaning Data type Description
P_CY Carry (CY) Flag BOOL Value stored in Carry Flag
Precautions for Correct Use
NSHLC(abc[1], USINT#80, USINT#3);
LD ST
abc[1] abc[1]
USINT#80
USINT#3
NSHLC
EN ENO
InOut
Size
Num
Discarded.
Last bit shifted out of register is stored in CY Flag.
InOut[0]
=abc[1]
Size = USINT#80 bits
InOut[1]
=abc[2]
InOut[1]
=abc[2]
InOut[8]
=abc[9]
InOut[8]
=abc[9]
InOut[9]
=abc[10]
InOut[9]
=abc[10]
InOut[0]
=abc[1]
CY
1 0 1
1 0 1
0 0 1
0 0 1
0 0 0
1
0 1 1
Num = USINT#3 (Shift 3 bits.)
FALSE inserted for Num = USINT#3 (3 bits).
Bit 0
Bit 7
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