Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données
Codes de produits
ATSAM4E-XPRO
89
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
LSR
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
hand 32-n bits of the result. And it sets the left-hand n bits of the result to 0. See
.
The LSR #n operation can be used to divide the value in the register Rm by 2
n
, if the value is 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.
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.
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.
Figure 12-9.
LSR #3
LSL
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
32-n bits of the result; and it sets the right-hand n bits of the result to 0. See
.
The LSL #n operation can be used to multiply the value in the register Rm by 2
n
, if the value is 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.
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.
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.
Figure 12-10. LSL #3
ROR
Rotate 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 moves the right-hand n bits of the register into the left-hand n bits of the result. See
32-n bits of the result; and it moves the right-hand n bits of the register into the left-hand n bits of the result. See
.
When the instruction is RORS or when ROR #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 rotation, bit[n-1], of the register
Rm.
ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to the last bit rotation, bit[n-1], of the register
Rm.
&DUU\
)ODJ
&DUU\
)ODJ