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2 Instructions
2-142
CP1E CPU Unit Instructions Reference Manual(W483)
Flags
Function
NASL
NASL(580) shifts D (the shift word) by the specified number of binary bits (specified in C) to the left
(from the rightmost bit to the leftmost bit). Either zeros or the value of the rightmost bit will be placed
into the specified number of bits of the shift word starting from the rightmost bit.
NSLL
NSLL(582) shifts D and D+1 (the shift words) by the specified number of binary bits (specified in C) to
the left (from the rightmost bit to the leftmost bit). Either zeros or the value of the rightmost bit will be
placed into the specified number of bits of the shift word starting from the rightmost bit.
Precautions
• For any bits which are shifted outside the specified word, the contents of the last bit is shifted to the
Carry Flag (CY), and all other data is lost.
• When the number of bits to shift (specified in C) is “0,” the data will not be shifted. The appropriate
flags will turn ON and OFF, however, according to data in the specified word.
Name Label Operation
Error Flag P_ER • ON when the control word C (the number of bits to shift) is not within range.
• OFF in all other cases.
Equals Flag P_EQ • ON when the shift result is 0.
• OFF in all other cases.
Carry Flag P_CY • ON when 1 is shifted into the Carry Flag (CY).
• OFF in all other cases.
Negative Flag P_N • ON when the leftmost bit is 1 as a result of the shift.
• OFF in all other cases.
C0
811
1215 0347
D
a
a
D
CY
Shift n-bits
Contents of “a” or “0” shifted in
N bits
Lost
C0
811
12
15
0347
D+1 D
CY
a
a
Shift n-bits
Contents of “a”
or “0” shifted in
N bits
Lost