HP HP-16C - Section 4: Arithmetic and Bit Manipulation Functions; Bit Summation; Double Functions

50 Section 4: Arithmetic and Bit Manipulation Functions
Keystrokes Display ([STATUS|: 2-08-1000)
(9](RLC] 11001110 b Carry bit (most
significant bit of high-
order portion) moves into
least significant bit
position of low-order
portion.
x % 00011100 b Switches X- and
Y-registers.
(9][RLC] 00111001 b C cleared: carry bit
moved into first part of
word and zero moved
into carry bit.
x % 11001110 b New word is 00111001
11001110.
(9][(cF]3 11001110 b Suppresses leading
Zeros.
Setting, Clearing, and Testing Bits
Individual bits in a word can be set to 1 or cleared to 0 using the
(set bit) and (clear bit) functions. In a manner analogous to
flag-testing, you can also test for the presence of a set bit with [B?].
If executed in a program, the result affects program execution.
To set, clear, or test a specific bit in a word:
e The word containing the specific bit must be in the Y-register.
e The magnitude of the number in the X-register specifies the
number of the bit to be set, cleared, or tested.
When the key ( or [CB]) is pressed, the stack drops and the word
affected returns to the X-register.
Bits are numbered from zero to one less than the word size, with the
least significant bit as bit number 0.
Keystrokes Display ([STATUS]: 2-16-0000)
11111111 11111111 b Enters quantity and copies
it into the Y-register.
1 11 b Bit number 3.
11110111 b Stack drops; resulting
word is in X-register.