Final answer:
The ARM instruction UBFX R5,R6, #12, #6 is used to extract a 6-bit field starting from the 12th bit position in register R6 and place it into register R5, clearing the upper bits in R5.
Step-by-step explanation:
The UBFX (Unsigned Bit Field Extract) instruction in ARM assembly language is used to extract a bit field from one register and place it into the least significant bits of another register, zeroing the upper bits. The instruction format is UBFX destination_register, source_register, #lsb, #width, where:
- destination_register is where the extracted bit field will be placed.
- source_register is the register from which bits will be extracted.
- #lsb indicates the least significant bit position (starting from 0) of the bit field in the source register.
- #width specifies the number of bits to extract.
In the provided question, the instruction UBFX R5,R6, #12, #6 will extract 6 bits starting from bit position 12 in R6 and will place them into the lower bits of R5, while the rest of R5 will be filled with zeros.