Propeller Manual

3: Assembly Language Reference – ROR
ROR
Instruction: Rotate value right by specified number of bits.
ROR Value, 〈#〉 Bits
Result: Value is rotated right by Bits.
•
Value (d-field) is the register to rotate right.
•
Bits (s-field) is a register or a 5-bit literal whose value is the number of bits to rotate
right.
Opcode Table:
–INSTR– ZCRI –CON– –DEST– –SRC– Z Result C Result Result Clocks
001000 001i 1111 ddddddddd sssssssss
Result = 0 D[0] Written 4
Concise Truth Table:
In Out
Destination Source Z C Effects Destination Z C
$0000_0000; 0 $0000_0001; 1 - -
wz wc
$0000_0000; 0 1 0
$1234_5678; 305,419,896 $0000_0004; 4 - -
wz wc
$8123_4567; -2,128,394,905 0 0
$8123_4567; -2,128,394,905 $0000_000C; 12 - -
wz wc
$5678_1234; 1,450,709,556 0 1
$5678_1234; 1,450,709,556 $0000_0010; 16 - -
wz wc
$1234_5678; 305,419,896 0 0
Explanation
ROR (Rotate Right) rotates Value right, Bits times. The LSBs rotated out of Value are rotated
into its MSBs.
If the
WZ effect is specified, the Z flag is set (1) if the resulting Value equals zero. If the WC
effect is specified, at the end of the operation, the C flag is set equal to Value’s original bit 0.
The result is written to Value unless the
NR effect is specified.
Propeller Manual v1.1 · Page 345