Rotating Bits - HP -16C Owner's Handbook Manual

48 Section 4: Arithmetic and Bit Manipulation Functions
Keystrokes Display ([STATUS]: 2-08-0000)
(f)]SHOW [DEC] 127 d ([ENTER]is not needed
because this function
terminates digit entry.)
00001111 b Each shift performs an
integer divide by 2 and
sets flag 4 because a 1 is
shifted into the carry bit.
[fJSHOW [DEC] (hold) 15 d
(release) 00001111 b
10000000 10000000 b
SHOW -128 d
[(9)[ASR] [¢)[ASR] 11100000 b
(g](AsR]
11110000 b
Sign bit is regenerated
and carry flag is cleared
with each shift.
SHOW -16 d
(release) 11110000 b
Rotating Bits
There are three general types of rotate functions on the HP-16C,
encompassing eight different functions.
¢ Rotate left and right ([RL], [RR]).
¢ Rotate left and right "through the carry bit" ([RLC], [RRC)).
* Rotate n places ([RLn], [RRn], [RLCn], [RRCn]).
Rotation. Pressing (rotate left) or (rotate right)
causes the contents of the X-register to rotate (or "circularly shift")
one bit to the left or right. Bits shifted out of the word re-enter it at
the other end. The carry flag is set if a 1 bit is rotated around the
end, and is cleared if a zero is rotated around the end.
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