ST STM32F4 Series User Manual

The STM32 Cortex-M4 instruction set PM0214
64/262 PM0214 Rev 9
ROR
Rotate right by n bits moves the left-hand 32 - n bits of the Rm register to the right by n places,
into the right-hand
32 - n bits of the result. It also moves the right-hand n bits of the register
into the left-hand
n bits of the result (see Figure 16).
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 Rm register.
Note: 1 If
n is 32, then the value of the result is same as the value in Rm , and if the carry flag is
updated, it is updated to bit[31] of
Rm .
2
ROR with shift length, n , more than 32 is the same as ROR with shift length n -32.
Figure 16. ROR #3
RRX
Rotate right with extend moves the bits of the Rm register to the right by one bit. And it
copies the carry flag into bit[31] of the result (see Figure 17).
When the instruction is RRXS or when RRX is used in operand2 with the instructions
MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated
to bit[0] of the
Rm register.
Figure 17. RRX #3
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ST STM32F4 Series Specifications

General

Brand	ST
Model	STM32F4 Series
Category	Computer Hardware
Language	English