SAM3N0A Atmel Corporation, SAM3N0A Datasheet - Page 82

• Manufacturer Part Number: SAM3N0A
• Manufacturer: Atmel Corporation

10.11.4.2
10.11.4.3
82
SAM3N
LSR
LSL
Logical shift right by n bits moves the left-hand 32-n bits of the register Rm, to the right by n
places, into the right-hand 32-n bits of the result. And it sets the left-hand n bits of the result to 0.
See
You can use the LSR #n operation to divide the value in the register Rm by 2
regarded as an unsigned integer.
When the instruction is LSRS or when LSR #n is used in Operand2 with the instructions MOVS,
MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to the last bit
shifted out, bit[n-1], of the register Rm.
Figure 10-5. LSR #3
Logical shift left by n bits moves the right-hand 32-n bits of the register Rm, to the left by n
places, into the left-hand 32-n bits of the result. And it sets the right-hand n bits of the result to 0.
See
You can use he LSL #n operation to multiply the value in the register Rm by 2
regarded as an unsigned integer or a two’s complement signed integer. Overflow can occur
without warning.
When the instruction is LSLS or when LSL #n, with non-zero n, is used in Operand2 with the
instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is
updated to the last bit shifted out, bit[32-n], of the register Rm. These instructions do not affect
the carry flag when used with LSL #0.
Figure 10-6. LSL #3
• If n is 32 or more, then all the bits in the result are cleared to 0.
• If n is 33 or more and the carry flag is updated, it is updated to 0.
• If n is 32 or more, then all the bits in the result are cleared to 0.
• If n is 33 or more and the carry flag is updated, it is updated to 0.
Carry
Figure
Figure 10-6 on page
Flag
31
0
0
31
10-5.
0
82.
...
...
5
4
5
3
4
2
3
11011A–ATARM–04-Oct-10
2
0
1 0
n
n
0
1 0
, if the value is
, if the value is
0
Carry
Flag