请用汇编帮我写一个51单片机篮球计分器，要求矩阵键盘s1A队加一分，s2A队加两分，s3AD队加3分，s4A队清零，时到是B队推类

好的，下面是用汇编语言编写的51单片机篮球计分器程序，实现了要求的功能，其中s1-s4为A队的加分和清零操作，s5-s8为B队的加分和清零操作：

; 定义矩阵键盘的引脚
COL1 equ P1.0
COL2 equ P1.1
COL3 equ P1.2
COL4 equ P1.3

ROW1 equ P1.4
ROW2 equ P1.5
ROW3 equ P1.6
ROW4 equ P1.7

; 定义数码管的引脚
DIG1 equ P2.4
DIG2 equ P2.5
DIG3 equ P2.6
DIG4 equ P2.7

; 定义数码管的显示字符
LEDChar db 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f

; 定义A队和B队的得分变量
scoreA db 0
scoreB db 0

; 延时函数
delay:  mov r7, #10
        djnz r7, $
        ret

; 数码管显示函数
display:    push psw
            push acc
            push b
            push dph
            push dpl
            mov cnt, #0
            mov a, num
            mov dph, #0
            mov dpl, #LEDChar
            div ab
            mov b, #1000
            div ab
            mov tmp, a
            mov a, b
            call show_digit
            mov b, #100
            div ab
            mov tmp, a
            mov a, b
            call show_digit
            mov b, #10
            div ab
            mov tmp, a
            mov a, b
            call show_digit
            mov b, #1
            div ab
            mov tmp, a
            mov a, b
            call show_digit
            pop dpl
            pop dph
            pop b
            pop acc
            pop psw
            ret

show_digit:  mov cnt, #0
            mov a, tmp
            mov dph, #0
            mov dpl, #LEDChar
            mul ab
            mov a, #0xff
            anl a, dpl
            mov dpl, a
            mov a, #0x0f
            anl a, cnt
            add a, #4
            mov tmp, a
            mov a, dpl
            mov P0, a
            mov DIG1, #1
            mov DIG2, #1
            mov DIG3, #1
            mov DIG4, #1
            mov a, tmp
            cjne a, #4, $
            mov DIG1, #0
            sjmp $$
            cjne a, #5, $
            mov DIG2, #0
            sjmp $$
            cjne a, #6, $
            mov DIG3, #0
            sjmp $$
            cjne a, #7, $
            mov DIG4, #0
            sjmp $$
            $$:    inc cnt
            mov a, cnt
            cjne a, #4, show_digit_end
            mov cnt, #0
show_digit_end: ret

; 键盘扫描函数
keyscan:    push psw
            push acc
            push b
            push dph
            push dpl
            mov key, #0
            mov a, #0x0f
            mov dph, #0
            mov dpl, #0
            mov cnt, #0
            mov ROW1, #1
            mov ROW2, #0
            mov ROW3, #0
            mov ROW4, #0
            mov COL1, #0
            mov COL2, #1
            mov COL3, #1
            mov COL4, #1
            sjmp keyscan_loop

keyscan_loop:
            mov a, ROW1
            jz keyscan_row1
            mov a, ROW2
            jz keyscan_row2
            mov a, ROW3
            jz keyscan_row3
            mov a, ROW4
            jz keyscan_row4
            $$:    inc cnt
            mov a, cnt
            cjne a, #16, keyscan_end
            mov cnt, #0
            mov ROW1, #1
            mov ROW2, #0
            mov ROW3, #0
            mov ROW4, #0
            mov COL1, #0
            mov COL2, #1
            mov COL3, #1
            mov COL4, #1
            sjmp keyscan_loop

keyscan_row1:
            mov a, #1
            mov key, a
            sjmp keyscan_end

keyscan_row2:
            mov a, #5
            mov key, a
            sjmp keyscan_end

keyscan_row3:
            mov a, #9
            mov key, a
            sjmp keyscan_end

keyscan_row4:
            mov a, #13
            mov key, a

keyscan_end:    mov cnt, #0
                mov ROW1, #0
                mov ROW2, #0
                mov ROW3, #0
                mov ROW4, #0
                pop dpl
                pop dph
                pop b
                pop acc
                pop psw
                ret

; 主函数
main:       mov a, #0x80
            mov P2, a
            mov a, #0xff
            mov P0, a
            mov a, #0xff
            mov P1, a
            mov a, #0x00
            mov cnt, a
            mov key, a
            mov tmp, a
            mov scoreA, a
            mov scoreB, a
            $$:    call keyscan
            cjne key, #1, $$
            inc scoreA
            sjmp $$

            cjne key, #2, $$
            mov a, #2
            add scoreA, a
            sjmp $$

            cjne key, #3, $$
            mov a, #3
            add scoreA, a
            sjmp $$

            cjne key, #4, $$
            mov scoreA, a
            sjmp $$

            cjne key, #5, $$
            inc scoreB
            sjmp $$

            cjne key, #6, $$
            mov a, #2
            add scoreB, a
            sjmp $$

            cjne key, #7, $$
            mov a, #3
            add scoreB, a
            sjmp $$

            cjne key, #8, $$
            mov scoreB, a
            sjmp $$

            sjmp $$
            call display
            sjmp $$

需要注意的是，汇编语言中没有变量类型，需要在程序开头为变量分配空间，也需要在程序中定义变量名和变量地址之间的关系。此外，汇编语言需要手动实现函数调用和返回，需要注意栈的使用。