Asked by: Sohaila Bertholdt
technology and computing data storage and warehousing

What does LDR do in lc3?

16
LDR stores the source register's value plus an immediate value offset and stores it in the destination register. LDI treats the source register as an address and stores the contents of memory at that address in the destination register. This function stores a value (source label) into a destination register.


Similarly, it is asked, what does STR do in lc3?

This function stores a value (source label) into a destination register. STR stores the value in a source register into a destination register. An immediate offset may also be used.

Additionally, how many bits are used to identify the program counter offset in an lc3 instruction? The LC-3 ISA has 15 instructions, each identified by its unique opcode. The opcode is specified by bits [15:12] of the instruction. Since four bits are used to specify the opcode, 16 distinct opcodes are possible. However, the LC-3 ISA specifies only 15 opcodes.

In this way, what does .fill do in lc3?

fill: tells assembler, put these bits into a word. . string: convert text to . FILL w/ one ascii code per word, NUL terminated.

What is the operation of the ST instruction?

Operation[edit] The ST instruction takes the 32-bit integer value contained in the source register specified by the first argument and stores that value in the memory address specified by the second argument (the target address).

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How many bits are needed for the opcode?

The instruction consists of opcode and operands. Given the instruction set of size 12, 4 bits are required for opcode (2^4 = 16). As there are total 64 registers, 6 bits are required for identifying a register.

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How many memory accesses are required for the processing of an LEA instruction?

LEA instruction makes one memory access.

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What is PC offset?

In computer science, an offset within an array or other data structure object is an integer indicating the distance (displacement) between the beginning of the object and a given element or point, presumably within the same object.

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What is LDI in assembly language?

Code note: ldi - This instruction stands for load immediate and it means 'load' (put ) into a particular named register a certain value named in the instruction, in this case the register named in Temp (which is r16) has the value FF put into it.

Ciriaco Schyktanz

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How many general purpose registers exist in the CPU of the lc3?

Many CPUs now have general purpose registers (GPRs), which may contain both data and memory addresses. Registers vary in both number and size, depending on the CPU architecture. Some processors have 8 registers while others have 16, 32, or more.

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What does BLKW mean?

.BLKW. . BLKW tells the assembler to set aside some number of sequential memory loca- tions (i.e., a BLocK of Words) in the program. The actual number is the operand of the .

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What does Marie's Skipcond instruction do?

The “SKIPCOND 000” cause the JUMP ELSE instruction to be jumped over if the AC is negative. Since the then-part code follows the JUMP ELSE instruction, it is only executed if X < Y. After the then-part code is executed, the JUMP END_IF causes the else-body to be skipped.

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What is St in assembly language?

ST is used to copy the fullword stored in the register specified by operand 1 into the fullword memory location specified by operand 2.

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