使用以下代码作为程序的开头。写一个程序找出最大和最小的数。最大和最小的数字需要分别保存在寄存器r7和r8中。对于ARMSim#，这些数字也需要显示在控制台和LCD屏幕上(使用Embest Board) 代入量) MOV r0, #0x00002000 MOV r1, #9 STR r1, [r0],#4 MOV r1, #3 STR r1, [r0],#4 MOV r1, #1 STR r1, [r0],#4 MOV r1, #4 STR r1, [r0],#4 MOV r1, #8 STR r1, [r0],#4 MOV r1, #5 STR r1, [r0],#4 MOV r1, #7 STR r1, [r0],#4 MOV r1, #2 STR r1, [r0],#4 MOV r1, #10 STR r1, [r0],#4 MOV r1, #6 STR r1, [r0],#4，注释用英文

; Initialize variables
MOV r7, #0   ; Maximum number
MOV r8, #0   ; Minimum number
MOV r0, #0x00002000 ; Start of array
MOV r1, #9   ; Array size

; Load first number into r7 and r8
LDR r2, [r0],#4 ; Load first number
MOV r7, r2      ; Set as maximum
MOV r8, r2      ; Set as minimum

; Loop through remaining numbers in array
Loop:
    LDR r2, [r0],#4 ; Load next number
    CMP r2, r7      ; Compare to current maximum
    BGT UpdateMax   ; If greater, update maximum
    CMP r2, r8      ; Compare to current minimum
    BLT UpdateMin   ; If less, update minimum
    SUBS r1, r1, #1 ; Decrement loop counter
    BNE Loop        ; Loop until all numbers have been checked

; Display results on console
MOV r0, #0x40000000  ; Address of UART data register
MOV r1, #0x0A        ; New line character
MOV r2, #0x20        ; Space character
MOV r3, r7           ; Maximum number
BL DisplayNumber     ; Display maximum
MOV r3, r8           ; Minimum number
BL DisplayNumber     ; Display minimum

; Display results on LCD screen
MOV r0, #0x08000108  ; Address of LCD control register
MOV r1, #0x01        ; Clear screen
STR r1, [r0]
MOV r1, #0x80        ; Set cursor to first row, first column
STR r1, [r0]
MOV r3, r7           ; Maximum number
BL DisplayNumberLCD  ; Display maximum
MOV r1, #0xC0        ; Set cursor to second row, first column
STR r1, [r0]
MOV r3, r8           ; Minimum number
BL DisplayNumberLCD  ; Display minimum

; End of program
END

; Subroutine to display a number on the console
; Inputs: r0 = UART data register address
;         r1 = character to send after number (e.g. new line or space)
;         r2 = character to use for padding (e.g. space or zero)
;         r3 = number to display
DisplayNumber:
    MOV r4, #0      ; Initialize digit count
    MOV r5, #10000  ; Initialize divisor
    MOV r6, #0      ; Initialize padding count
    Loop1:
        CMP r5, #0   ; Check if divisor is zero
        BEQ EndLoop1 ; If zero, exit loop
        MOV r7, #10  ; Divide by 10
        SDIV r3, r3, r7
        MUL r3, r3, r7
        SUBS r6, r6, #1 ; Decrement padding count
        BGT PadNumber    ; If padding is needed, jump to PadNumber
        CMP r3, #0   ; Check if number is zero
        BEQ EndLoop1 ; If zero, exit loop
        ADDS r4, r4, #1 ; Increment digit count
        MOV r7, #0x30   ; Convert digit to ASCII code
        ADDS r7, r7, r3
        STR r7, [r0] ; Send digit to console
        EndLoop1:
        MOV r7, #0x30   ; Convert padding character to ASCII code
        PadNumber:
        STR r7, [r0] ; Send padding character to console
        SUBS r5, r5, #10    ; Divide divisor by 10
        B Loop1     ; Loop until all digits have been displayed
    STR r1, [r0]    ; Send end character to console
    BX LR       ; Return from subroutine

; Subroutine to display a number on the LCD screen
; Inputs: r0 = LCD control register address
;         r2 = character to use for padding (e.g. space or zero)
;         r3 = number to display
DisplayNumberLCD:
    MOV r4, #0      ; Initialize digit count
    MOV r5, #10000  ; Initialize divisor
    MOV r6, #0      ; Initialize padding count
    Loop2:
        CMP r5, #0   ; Check if divisor is zero
        BEQ EndLoop2 ; If zero, exit loop
        MOV r7, #10  ; Divide by 10
        SDIV r3, r3, r7
        MUL r3, r3, r7
        SUBS r6, r6, #1 ; Decrement padding count
        BGT PadNumberLCD ; If padding is needed, jump to PadNumberLCD
        CMP r3, #0   ; Check if number is zero
        BEQ EndLoop2 ; If zero, exit loop
        ADDS r4, r4, #1 ; Increment digit count
        MOV r7, #0x30   ; Convert digit to ASCII code
        ADDS r7, r7, r3
        STR r7, [r0, #4] ; Send digit to LCD data register
        EndLoop2:
        MOV r7, #0x30   ; Convert padding character to ASCII code
        PadNumberLCD:
        STR r7, [r0, #4] ; Send padding character to LCD data register
        SUBS r5, r5, #10    ; Divide divisor by 10
        B Loop2     ; Loop until all digits have been displayed
    BX LR       ; Return from subroutine