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© 2005-2011 Microchip Technology Inc. DS70157F-page 271
Section 5. Instruction Descriptions
Instruction
Descriptions
5
LSR
Logical Shift Right Ws
Implemented in: PIC24F PIC24H PIC24E dsPIC30F dsPIC33F dsPIC33E
X X X X X X
Syntax: {label:} LSR{.B} Ws, Wd
[Ws], [Wd]
[Ws++], [Wd++]
[Ws--], [Wd--]
[++Ws], [++Wd]
[--Ws], [--Wd]
Operands: Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation: For byte operation:
0 → Wd<7>
(Ws<7:1>) → Wd<6:0>
(Ws<0>) → C
For word operation:
0 → Wd<15>
(Ws<15:1>) → Wd<14:0>
(Ws<0>) → C
Status Affected: N, Z, C
Encoding:
1101 0001 0Bqq qddd dppp ssss
Description: Shift the contents of the source register Ws one bit to the right, and place
the result in the destination register Wd. The Least Significant bit of Ws is
shifted into the Carry bit of the STATUS register. Zero is shifted into the
Most Significant bit of Wd. Either register direct or indirect addressing
may be used for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
Words: 1
Cycles:
1
(1)
Note 1:
In dsPIC33E and PIC24E devices, the listed cycle count does not apply to read and
read-modify-write operations on non-CPU Special Function Registers. For more
details, see
Note 3
in
Section 3.2.1 “Multi-Cycle Instructions”
.
C
0
Protego_Release_01_05-Related-OEM-Documentation-PIC24FJ64GA004-Programmers_Reference_Manual.pdf