12. The MOD R/M Byte: If the mod R/M byte has the following data in it: mod 11 reg 011 a. What addressing mode is being use in the instruction? b. What is the source register (use 16 bit register)? c. What is the destination register(use 16 bit register)? d. What does the assembly instruction look like? r/m 000
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- 5. Load the register (CL) from the memory location [050OH] then subtract the content of this register from the accumulator (AL). Correct the result as a (BCD) numbers. Let [0500H] 12H & AL 3FH %3DThe program counter (PC) contains the address of the next instruction -pair to be fetched from memory? a. True O b. false12. The MOD R/M Byte: If the mod R/M byte has the following data in it: mod 11 reg 011 a. What addressing mode is being use in the instruction? b. What is the source register (use 16 bit register)? c. What is the destination register(use 16 bit register)? d. What does the assembly instruction look like? r/m 000
- A digital computer has a memory unit with 24 bits per word. The instruction set consists of 150 different operations. All instructions have an operation code part (opcode) and an address part (allowing for only one address). Each instruction is stored in one word ofmemory.a. How many bits are needed for the opcode?b. How many bits are left for the address part of the instruction?c. What is the maximum allowable size for memory?d. What is the largest unsigned binary number that can be accommodated in one word of memory?1. What instruction (mov, Idr, Idrb, str, strb) is used to... a. Put a byte from memory into a register b. Put a register value into another register c. Put the address of a label into a register d. Put a register value into a memory address e. Put an immediate into a register 2. Which instruction (move, load, or store) lists the source followed by the destination? 3. What punctuation is used to indicate you're reading the address of a label? 4. What punctuation is used to indicate the register value is to be treated as an address? 5. Assuming the following is at the start of the data section: Array2 dcd 45, 23, 67, 31 a. What would be in r0 after 1dr r0, Array2 executes? b. What would you add to rO to have the address point to the 2nd value in the array? 6. (Bonus worth 0.2 points) Given our simulator's configurations, etc., if r2 = 0x0800001C, what value(s) in memory would be changed by str r1, [x2] ?1. For the machine instruction 709F, the op-code field is ____ and the operand field is ____. Write the instruction as an actual 16-bit pattern.
- 1. Study this program , then answer the questions that follow : MOV AL, 64H ADD AL,27H DAA a) What does the accumulator contain immediately after the ADD instruction is executed ? What do the CY and AC flags contain? b) What does the accumulator contain after the DAA instruction is executed? What do the CY and AC flags contain? 2. Write a subroutine that will perform the function of the DAA instruction.Using the following data definitions: bytel BYTE byte2 BYTE word1 WORD word2 WORD 3 OFFh, 1, 2 14h OFFFFh, 1, 2 word3 SWORD 7FFFh, 8000h word4 SWORD 9000h dword1 DWORD 10h, 20h, 30h, 40h dArray DWORD 10 DUP (?) Write an instruction that moves the lower 8 bits of word2 into the AL register.Select the specialized uses of the EFLAGS register. which is the correct answer? you can choose more than one correct answer. A) contains status and control flags B) each flag is a single binary bit C) includes the instruction pointer D) each flag contains 32 bits
- Using the mov.w instruction we copy the 16-bit word 0xB612 to the address 0x1C20. You do not need to know any details of the instruction here, all you care is that the word is stored at the given address. (a) What is the byte that is stored in location 0x1C20? (b) What is the byte that is stored in location 0x1C21?0001 = Load AC from memory 0010 = Store AC to memory 0101 = Add to AC from memory 0011 = Load AC (the accumulator register) from an I/O device 0111 = Store AC to an I/O device With these instructions, a particular I/O device is identified by replacing the 12-bit address portion with a 12-bit device number. Remember that a number ending with a small ‘h’ means the number is a hexadecimal number. What is the hexadecimal string that expresses the following instructions? Load AC from memory location 62h. Add the contents of memory location 451h to AC. Store AC to memory location 8h. Store AC to I/O device number 8h.(d) The table below shows the ALUcontrol signal of the datapath we discussed in class. Instruction Funct ALU Орсode ALUop ALU action operation field control Iw 00 load word XXXXXX add 0010 Sw 00 store word XXXXXX add 0010 beq 01 branch equal subtract 0110 XXXXXX R-type 10 add 100000 add 0010 R-type 10 subtract 100010 subtract 0110 R-type 10 AND 100100 AND 0000 R-type 10 OR 100101 OR 0001 R-type 10 set on less than 101010 set on less than 0111 You want to add the bne instruction into the datapath, which already includes the required hardware for the instruction. Write out the ALUop for bne and how you can determine whether the bne results in the branch to be taken.