For your first project, you will design a simple 8051 program using Keil (no phy

Question

For your first project, you will design a simple 8051 program using Keil (no physical implementation). Your task is to design a 4-bit Fibonacci sequence, available on-demand to the user. The Fibonacci sequence is a widely-used sequence in scientific applications. Its first two numbers are 0 and 1, and any other number in the sequence can be calculated as a sum of two previous numbers. The sequence for the first five (5) numbers is as follows: 0, 1, 1, 2, 3. Your task is to write an ASM program to generate a Fibonacci sequence by dividing it into the separate modules listed below:

a) Assume there are 4 switches connected to the lower 4 bits of P1 for a user to be able to enter any combination desired up to 1510 (15 possibilities). Assume that if the user enters 0x00, then the program does nothing and waits for a proper input. Write code to take the value input by the user and store it in R5. Make sure that the upper 4 bits of P1 are cleared before storing the input value in R5.

b) Pin P2.1 will act as a control input, determining the source of the Fibonacci sequence output to the user. If P2.1 is set to '1', then the Fibonacci sequence will be read from the ROM. You will need to calculate the values of the first 15 Fibonacci numbers and write code to store them in a look-up table in the ROM starting at address 200H, reading them one by one and outputting them to the user, as described in the next section. If P2.1 is set to '0', the Fibonacci sequence will be calculated on-the-fly. You can use any registers you want (except the ones already in use) to accomplish this. It may be the case that for some numbers in the sequence, the value will be larger than the memory/registers can accommodate. For that/those case(s), you will need to set the Carry (CY) bit to indicate that the number is larger than we can display with 8 bits. The remaining lower 8 bits of the number will be displayed to the user.

c) Write code that reads the input value stored in R5 and outputs the list of Fibonacci numbers based on the input value (e.g. If R5 = 5, the first five (5) Fibonacci numbers will be displayed.) Once a value is available, it needs to be displayed on P3. Insert a delay of 27,250 µs after displaying each number and show the full delay subroutine in your code. Assume a standard 8051 microcontroller is used with a frequency of 11.0592 MHz.

I am just stumped on how to begin this project. Could anyone lead me in the right direction?

Explanation / Answer

          .Ltext0:
                    .section   .rodata
                    .align 8
                .LC0:
0000 0A20456E        .string   " Enter the number of items in the sequence: "
     74657220
     74686520
     6E756D62
     6572206F
                .LC1:
002e 256400         .string   "%d"
                .LC2:
0031 0A202564        .string   " %d %d"
     20256400
                .LC3:
0039 20256420        .string   " %d "
     00
                    .text
                    .globl   main
                main:
                .LFB0:
                    .cfi_startproc
0000 55              pushq   %rbp
                    .cfi_def_cfa_offset 16
                    .cfi_offset 6, -16
0001 4889E5         movq   %rsp, %rbp
                    .cfi_def_cfa_register 6
0004 4883EC20        subq   $32, %rsp
0008 C745F800        movl   $0, -8(%rbp)
     000000
000f C745E800        movl   $0, -24(%rbp)
     000000
0016 C745EC01        movl   $1, -20(%rbp)
     000000
001d C745F001        movl   $1, -16(%rbp)
     000000
0024 C745F401        movl   $1, -12(%rbp)
     000000
002b BF000000        movl   $.LC0, %edi
     00
0030 B8000000        movl   $0, %eax
     00
0035 E8000000        call   printf
     00
003a 488D45E0        leaq   -32(%rbp), %rax
003e 4889C6         movq   %rax, %rsi
0041 BF000000        movl   $.LC1, %edi
     00
0046 B8000000        movl   $0, %eax
     00
004b E8000000        call   __isoc99_scanf
     00
0050 8B55EC         movl   -20(%rbp), %edx
0053 8B45E8         movl   -24(%rbp), %eax
0056 89C6            movl   %eax, %esi
0058 BF000000        movl   $.LC2, %edi
     00
005d B8000000        movl   $0, %eax
     00
0062 E8000000        call   printf
     00
0067 C745E401        movl   $1, -28(%rbp)
     000000
006e EB5B            jmp   .L2
                .L7:
0070 8B45EC         movl   -20(%rbp), %eax
0073 8B55E8         movl   -24(%rbp), %edx
0076 01D0            addl   %edx, %eax
0078 8945FC         movl   %eax, -4(%rbp)
007b 8B45FC         movl   -4(%rbp), %eax
007e 89C6            movl   %eax, %esi
0080 BF000000        movl   $.LC3, %edi
     00
0085 B8000000        movl   $0, %eax
     00
008a E8000000        call   printf
     00
008f 8B45EC         movl   -20(%rbp), %eax
0092 8945E8         movl   %eax, -24(%rbp)
0095 8B45FC         movl   -4(%rbp), %eax
0098 8945EC         movl   %eax, -20(%rbp)
009b C745F001        movl   $1, -16(%rbp)
     000000
00a2 EB1A            jmp   .L3
                .L6:
00a4 C745F401        movl   $1, -12(%rbp)
     000000
00ab EB04            jmp   .L4
                .L5:
00ad 8345F401        addl   $1, -12(%rbp)
                .L4:
00ba 8345F001        addl   $1, -16(%rbp)
00b1 817DF472        cmpl   $27250, -12(%rbp)
     6A0000
00b8 7EF3            jle   .L5
                .L3:
00c7 8345E401        addl   $1, -28(%rbp)
00be 817DF072        cmpl   $27250, -16(%rbp)
     6A0000
00c5 7EDD            jle   .L6
                .L2:
00cb 8B45E0         movl   -32(%rbp), %eax
00ce 3945E4         cmpl   %eax, -28(%rbp)
00d1 7E9D            jle   .L7
00d3 B8000000        movl   $0, %eax
     00
00d8 C9              leave
                    .cfi_def_cfa 7, 8
00d9 C3              ret
                    .cfi_endproc
                .LFE0:
                .Letext0:

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