Suppose that the following instructions are found at the given locations in memory: 20 LDA 50 21 BRP 22 22 STO 51 50 100 51 100 Choose the contents of the registers: PC, MAR, MDR, IR, A at the end of fetch-execute cycle for instruction 22: PC MAR MDR IR A

7. Given the number 0x123456 in PIC18 and the starting address is 0x123 a. Write instruction sequence to multiply it by 8 b. Write instruction sequence to divide it by 8

Convert the given hex value to its R-format MIPS instruction by completing the following table. The instruction and letters for registers must be in lower case. DO NOT TYPE DOLLAR SIGNS WITH REGISTERS. Hex Opcode (decimal) rs (decimal) rt (decimal) rd (decimal) funct (decimal) Instruction 02488822 O 18 16 17 34 sub s4 $$1 " $ to " LA

True or false

3. For each instruction in the table, write 8 hexadecimal digits that represent the 32 bits in the destination register after the instruction is executed. Assume s0 is 0x98AB3C6A, s1 is 0x20503666. Instructions to, 50, s1 t1, so, s1 t2, so, s1 t3, 50, 51 addi t4, 50, 0x210 wwwwwww andi t5, 50, -16 add and or xor slli t6, 50, 12 srai s2, 50, 8 Dest. reg. in 8 hexadecimal digits

In this case, every instruction gets its own data in a way that is completely separate from how the data of other instructions is obtained. We utilize: A Multiple Data/Instruction B Multiple Data/Instruction C Singular Data Single Inst D Singe Inst Multiple

1) For each of the instructions below, assume the initial conditions shown for r3-r5 and the flags. For each instruction, show the value of any registers that are changed. If the instruction affects flags, show the value for all flags that are affected. Initial conditions: r3 = 0XF0E1 D2B3 r4 = 0x1496 3A40 r5 = 0×47CE 811E NZCV = 1010 a) ADCS r4,r3,r4 b) CMP r3,r5 c) TST r4,#0xF d) MVNS r5,r3 e) ASRS r3, r3, #1

20 LDA 50 21 SUB 51 50 100 51 200 Choose the contents of the registers: PC, MAR, MDR, IR, A at the end of fetch-execute cycle for instruction 20: PC MAR MDR IR A

MCQ select more than one