Question

2. Write an assembly program that counts the number of bits that are set e set to a I' in RO, and writes the total to R1 When finished, enter an infinite loop. Add loop MOV R3 , 0b0; AND #0b1. R0, R3; CMP R3 . #0b1; ADDEQRI , #0b1; LSR RO, # 060; BNE add loop infinite loop; b irnfinite loop

Answer 1

Given Resisters R_0 & R_1 So assuming 8085 microprocessors. Instructions & Meaning RRC rightarrow Rotate accumulator Right. Contents in Accumulator, MSB is shifted to angle SB & Carry rightwardsdoublearrow curry = MSB JNC rightwardsdoublearrow Jump if carry flog is Not one i. e Not set JN2 rightwardsdoublearrow Jump if zero flog is Not one i. e Not set INR rightwardsdoublearrow Increment DNR rightwardsdoublearrow Decrement MUI rightwardsdoublearrow Move Immediate data. program Since R_0 is 8 bit register counter is set to 8. downarrow C register count of 1's in D register Program MOC A, F_0 MUI D, 00H: counter set to 00. MUI C, 08H: counter set to 8. Repeat: RRC JNC decrement counter INR D: since carry = 1 rightwardsdoublearrow, bit is, So increment is count. decrement counter: DCR C: 1 rotation completed rightwardsdoublearrow 1 bit is read p_0 decrement by 1. INZ Repeat l zero Flog Not set of still all bits are Not read So again shift Accumulator MOV R_1, A: No of 1's count Accumulator to R_1.

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