Advanced Microprocessor System Assume the initial values of

Advanced Microprocessor System

Assume the initial values of registers are given in the following form. An assembly program section with PUSH/POP instructions is given below. Find the final values of all registers at the end of the execution of the program section. Stack push and pop push {r1} push {r2, r3, r4} pop {r4, r3, r2} Explain the addressing mode for each of the instruction listed in the table.

Solution

Instruction Addressing Mode MOV R3,#0 Register Addressing Mode: Content of the Memory Location #0 will be copied in Register R3. But no content is provided. Let\'s assume the content of #0 is 02H. Then 02H will be copied in R3. MOV R0, R2 Register Addressing Mode:Content of R3 is copied in Register R0 and thus register R0 will have value of 02H LDR R3, [R0,#240] Load R3 from a word 960 bytes above the address of R0 and increments R0 by 960. STR R2, [R0],#4 Stores a word from R2 to the address of R0 and then increment R0 by 4.