To exchange the value of registers BX =1256H and DX=7894H by using stack instruction, this is done by written an assembly program as:
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- A(n) ________________ instruction always alters the instruction execution sequence. A(n) ______________ instruction alters the instruction execution sequence only if a specified Condition is true.The instruction used to copy two bytes from the stack to the Flags Register is: SAHF CMC PUSHF LAHF POPF STC The instruction that can be used to exchange between BL and BH is: * ROL BX, 4 ROL BL, BH ROR BX, 16 ROR BH, BL ROR BX, 8 RCR BX, 8 RCR BL BH To divide the signed number in AX by 2 using shift operations, which instruction should be used: * SAL AX, 1 SHL AX, 2 SAL AX, 2 SHL AX, 1 SHR AX, 1 SHR AX, 2 SAR AX, 1 SAR AX, 2LMC Instruction SetOpcode Mnemonic Definition 1xx ADD Add 2xx SUB Subtract 3xx STO Store 5xx LDA Load 6xx BR Branch Unconditionally 7xx BRZ Branch on zero 8xx BRP Branch on positive 901 IN Input 902 OUT Output 000 HLT COB Halt/Coffee break ii) Which instructions are not needed anymore and why?
- (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.Microcontroller (PIC16F877A) : For MOVF instruction: The Zero Flag (Z) Sometimes it becomes zero and sometimes it becomes one. I need two examples: First: when Z = 0 second: Z = 1 Thank you!You are given a before condition of the registers eax, ebx, edx and an instruction. Choose the correct after condition of eax, edx Before condition: EAX: 00 00 00 11 EBX: 00 00 00 OC EDX FF FF FF 03 Instruction: CWD idiv bx After condition: EAX: 00 00 00 51 EDX: FF FF FF 01 O EAX: 00 00 05 01 EDX: FF FF FF 03 EAX: 00 00 00 01 EDX: 00 00 00 05 O EAX: 00 00 00 01 EDX: FF FF 00 05
- The instruction used to fill DX with the its sign bit is: * CWD SAR DX, 1 SAR DX, SF SHR DX, CL SHR DX, SF SAR DX, 10 SAR DX, [SF] SAR DX, 16SP=1239H, SS=9876H, the physical address is AAAFOH Non of them 1BC06H 0AAAFH 99999H if BX=1000, DS=0400, and AL=EDH, for the following instruction: MOV [BX] + 1234H, AL. the physical address is 6324H O 4244H 4234H 6234H 6243H OThe instruction that pushes the contents of the specified register/memory location on to the stack is PUSHF O POPF O PUSH O POP O This flag is used by the instructions that perform BCD .(binary coded decimal) arithmetic Carry Flag O Parity Flag O Auxiliary Carry Flag the Direction Flag O
- BX=FFFF, after instruction INC BX is executed, CF ||Write down the values of destination operands and flags after the execution of each instruction: code 1 mov cx, sub cx, 1 ; (a) CX = ? ZF = ? mov cx, sub cx, 1 ; (b) CX = ? SF = ? mov al, 0FFH add al, 1 ; (c) AL = ? CF = ? mov al, 0 sub al, 1 ; (d) AL = mov al, 7Fh add al, 1 ; (e) AL = ? CF = ? ? OF = ? mov al, -128 neg al ; (f) CF = ? OF = ?1. T/F - if (B)=006000 (PC)=003600 (X)=000090, for the machine instruction 0x032026, the target address is 003000.2. T/F – PC register stores the return address for subroutine jump.3. T/F – S register contains a variety of information such as condition code.4. T/F – INPUT WORD 1034 – This means Operating system should reserve 1034 bytes in memory5. T/F - In a two pass assembler, adding literals to literal table and address resolution of local symbol are done using first pass and second pass respectively.