Assembly Pic汇编中指令流的模糊性

在这段代码中，我检查按钮是否按下，如果SW11按下，我将流程转发到比较功能。按键结构如下：

 aftersw00:



    movf    counter,0
    call    ledtable
    movwf   countertab
    call    led

    call    disp1

    movf    display2,0
    call    displaytable23
    movwf   displaytab2
    call    disp2                  //show on display2


    movf    display3,0
    call    displaytable23
    movwf   displaytab3
    call    disp3                 //show on display3
    call    assignRandomNumber
    call    delay

    bsf     PORTB,1               //here I make RB1,to disable sw4,sw5,sw6,sw7
    btfsc   PORTB,7               //here I check if RB7 pressed, if pressed RB7 becomes 0 
        goto    $+5           //if not pressed, it must go +5 instructions forward
        btfss   PORTB,4        //check if button is released
    goto    $-1                  
        bcf     PORTB,1        //if pressed and released, goto compare function
        goto    compare
    bcf     PORTB,1

    btfsc   PORTB,4             //check for sw4 press, it RB4 initially 1,when pressed it becomes 5
        goto    $+5             //if not pressed go +5 instructions forward
        btfss   PORTB,4         //to check if released
    goto $-1
        decf    display2,1      //if pressed and released, decrement display2                            
    goto    aftersw00           //and go to aftersw00 function again
    btfsc   PORTB,5               
        goto    $+5
        btfss   PORTB,5
    goto $-1
        incf    display2,1
    goto    aftersw00               
    btfsc   PORTB,6
        goto    $+5
        btfss   PORTB,6
    goto $-1
        decf    display3,1
    goto    aftersw00
    btfsc   PORTB,7
        goto    aftersw00
    btfss   PORTB,7
    goto    $-1
        incf    display3,1
    goto    aftersw00

---

我通过设置使RB1禁用

 bsf PORTB,1

为了确保第三行，即SW11被按下，但从现在起，我只将display2和display3变量增加到2，然后显示一些不可预测的内容

更新：我想了解为什么指令流不同，为什么display2和display3在第一次查看时只能增加到2。。。

incf display3,1

未执行的原因是您在第一次进行pin检查时：

btfsc   PORTB,7       //here I check if RB7 pressed, if pressed RB7 becomes 0 
goto    $+5           //if not pressed, it must go +5 instructions forward
btfss   PORTB,4       //check if button is released

相反

btfsc   PORTB,4       //here I check if RB4 pressed, if pressed RB4 becomes 0 
goto    $+5           //if not pressed, it must go +5 instructions forward
btfss   PORTB,4       //check if button is released

因此，如果

PORTB，7

被清除（按下），则不应执行其余代码

顺便说一下。 当您按下其中一个按钮时，MCPU wiat将进入环路，直到该按钮松开。这是糟糕的代码设计

btfsc   PORTB,4       //here I check if RB4 pressed, if pressed RB4 becomes 0 
goto    $+5           //if not pressed, it must go +5 instructions forward
btfss   PORTB,4       //check if button is released