High−level Instructions
3 − 277
Description
Rotates “n” bits of the 16-bit data specified by D to the left.
Example: Rotates 1 bit to the left
····
Bit position
·····
D
15 12 11 8 7 4 3 0
····
Bit position
·····
D
15 12 11 8 7 4 3 0
Special internal relay
R9009 (carry flag)
Data in bit position 15
0
0101 01010101 0101
010101010101 0101
When “n” bits are rotated to the left,
− The data in bit position 16-n (n th bit starting from bit position 15) is transferred to special internal
relay R9009 (carry flag).
− “n” bits starting from bit position 15 are shifted out to the left and then shifted into the lower bit
positions of the 16-bit data specified by D.
For “n”, only the lower 8 bits in the 16 bit data are valid.
15 0
n
Range of n: K0 to K255
(H00 to HFF)
Upper 8 bits
are invalid
00000000
———— ————
Precaution during programming
If the specified “n” is a multiple of 16 bits, the data will be the same as that before the operation.
e.g.,
n = K16: same operation as n = K0 (The carry flag does not change, either.)
n = K17: same operation as n = K1
n = K32: same operation as n = K0 (The carry flag does not change, either.)
n = K33: same operation as n = K1
Flag conditions
・Error flag (R9007): Turns on and stays on when the area specified using the index modifier
exceeds the limit.
・Error flag (R9008): Turns on for an instant when the area specified using the index modifier
exceeds the limit.
・Carry flag (R9009): Turns on for an instant when the data in bit position 16-n is recognized as 1.
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