MPLAB X Simulator，PIC24FJ64GB002定时器的指令编号错误

你好，我是新的MPLAB X和24F微控制器，但我用PIC16F和一个18F的项目，所有与旧IDE。我用MPLAX和24FJ64 GB00启动了一个新的项目，在模拟中发现了以下问题：当我用分频器8启动定时器时，看起来好像缺少了一个指令周期。预分频器＝1，没有问题。在附图中，你可以看到我的样本。周期设置为10（PR1＝9），预分频器为8。断点设置为中断time1，PIN是为了调试目的而切换的。正如你在逻辑分析仪中看到的（i缩放标记区域精确地设置它们），10个切换周期采用790个指令，正确的是800。秒表也显示了ISRs之间的79条指令。在我的代码中有错误吗？还是在模拟器中只是bug？如果有bug，有可能解决吗？旧IDE模拟器更好吗？这个错误本身并不是那么糟糕，但是我驾驶的是2个不同时间的SEP马达，它们必须是同步的。所以我想在模拟中测试长时间的行为。谢谢和问候，Aleksandar。



      以下为原文

    Hi there,

I am new with MPLAB X and 24F microcontrollers, but I made a caouple of projects with PIC16F and one with 18F, all with old IDE. I started a new project with MPLAB X and 24FJ64GB002 and found following problem in simulation:
When I start timer with prescaler 8, it looks like one instruction cycle is missing. With prescaler = 1, there are no problems.

In the attached image YOu can see my sample. Period is set to 10 (PR1=9), prescaler to 8. Breakpoint is set to interrupt Timer1, Pin is toggled for debug purposes. As You can see in Logic Analyzer (I zoomed marker areas to exactly set them), 10 toggle cycles are taking 790 instructions, correct would be 800. Stopwatch also shows 79 instructions between ISRs.

Is there any error in my code or is it just bug in simulator?
If there is a bug, is there any possibility to workaround?
Is simulator in old IDE better?

The error itself is not so bad, but I am driving 2 sep motors with different timings and they have to be synchronous. So I wanted to test long time behaviour in simulation.

void PIN_MANAGER_Initialize(void)
{
    /****************************************************************************
     * Setting the Output Latch SFR(s)
     ***************************************************************************/
    LATA = 0x0000;
    LATB = 0x0000;

    /****************************************************************************
     * Setting the GPIO Direction SFR(s)
     ***************************************************************************/
    TRISA = 0x001F;
    TRISB = 0xEFBB;

    /****************************************************************************
     * Setting the Weak Pull Up and Weak Pull Down SFR(s)
     ***************************************************************************/
    CNPU1 = 0x0000;
    CNPU2 = 0x0000;

    /****************************************************************************
     * Setting the Open Drain SFR(s)
     ***************************************************************************/
    ODCA = 0x0000;
    ODCB = 0x0000;

    /****************************************************************************
     * Setting the Analog/Digital Configuration SFR(s)
     ***************************************************************************/
    AD1PCFG = 0x001C;
}
uint8_t g_nextPinVal = 0;

void __attribute__ ( ( interrupt, no_auto_psv ) ) _T1Interrupt ( )
{
    PORTBbits.RB2 = g_nextPinVal;
    g_nextPinVal = (g_nextPinVal==0)?1:0;

    IFS0bits.T1IF = false;
}

int16_t main(void)
{
    /* Initialize IO ports and peripherals */
    PIN_MANAGER_Initialize();
    //TMR1 0;
    TMR1 = 0x0000;
    //Period = 0.00004 s; Frequency = 2000000 Hz; PR1 10;
    PR1 = 10-1;
    //TCKPS 1:8; TON enabled; TSIDL disabled; TCS FOSC/2; TSYNC disabled; TGATE disabled;
    T1CON = 0x0000;
    T1CONbits.TCKPS = 0b01; // prescaler = 8
   
    IFS0bits.T1IF = false;
    IEC0bits.T1IE = true;

    T1CONbits.TON = 1;
   
    while(1)
    {
    }
}


Thanks and greetings,
Aleksandar
   Attached Image(s)