怎么用两个定时器驱动一个伺服电机

我想用两个定时器驱动一个伺服电机。time1，16位，管理20毫秒周期，并将输出PORT.B0设置为1.Time0，8位，管理1毫秒的持续时间，并设置输出端口B0至0。我的问题是：伺服不动。我断开了伺服电机。我连接了一个范围。当我用范围内的光标来测量时间的时候，我检查了这个周期T持续时间大约是40毫秒，而不是20毫秒2x。当我用范围内的光标测量时间的时候，thTaTon持续时间大约是2毫秒，而不是1毫秒2x。在这些条件中，我理解了为什么伺服。马达不动。我检查了所有的计算，以便设置良好的值TMR0、TMR1L和TMR1H寄存器。但是在代码下：//PIC16F87// 8 MHz / /Time1 / /预分频器1:1//TMR1预加载＝25536 / /中断时间：20 MsHar CNT＝0；空隙IITTIMER 1）{T1CONN＝0X01；//T1CON寄存器＞TMR1ON位＝1＞Time1。TMR1IFN1比特＝0；//PIR1寄存器＞TMR1没有溢出。1H＝0x63；TMR1LY＝0xC0；TMR1IELY比特＝1；//PIE寄存器＞TMR1溢出中断。ITCON＝0xC0；//ITCCON寄存器＞GIE位＝1和PEE比特＝1。}//Time0//预分频器1:1/TMR0预加载＝56／/中断时间：100个US（0，1 ms）空隙IITTIMER 0（）{OpthyReg＝0x88；/PSA比特＝1和G。Prescaler被分配给WDT & GT；PosiClar＝1:1//RBPU位＝1；GTCO0＝0xA0；}空隙中断（）{{（TMR1IF1比特＝1）{TMR1IF＝56；TMR1H＝0x63；TMR1L＝0xC0；PORT.B0＝1；TMR0IFN1比特＝0；}（TMR0IF1比特＝1）{CNT++；TMR0IFN1比特＝0；TMR。t；0＝56；} }安塞尔＝0；ANSELH＝0；C1ONYBIT＝0；C2ONYBIT＝0；TrISD＝0；//端口D COMPURE EN SORTI.PORTD＝0；//初始化端口DD 0 0 .IITIN Time1（）；{IF（CNT= 10）{PORT.B0= 0；CNT= 0；}，同时（1）；}



      以下为原文

    I want to drive a servomotor with two timers.Timer1, 16 bits, manage the 20 mS period, and set output portd.b0 to 1.Timer0, 8 bits, manage the 1 mS Ton duration, and set output portd.b0 to 0.My problem :Servo doesn't move. I disconnected the servomotor. I connected a scope.When measuring time with cursors on the scope I checked that period T duration is about 40 mS, instead of 20 mS. 2x more.When measuring time with cursors on the scope I checked that Ton duration is about 2 mS, instead of 1 mS. 2x more. In these conditions I understand why the servomotor doesn't move. I checked all calculations in order to set with good values TMR0, TMR1L and TMR1H registers. But in vain. Here under the code :// PIC 16F887
// 8 MHz// Timer1
// Prescaler 1:1
// TMR1 preload = 25536
// Interrupt time : 20 mSchar cnt = 0;void Init_Timer1()
{
T1CON = 0x01;          // T1CON register > TMR1ON bit = 1 > Timer1 is enabled.
TMR1IF_bit = 0;        // PIR1 register > TMR1 has not overflowed.
TMR1H = 0x63;
TMR1L = 0xC0;
TMR1IE_bit = 1;        // PIE register > TMR1 overflow interrupt is enabled.
INTCON = 0xC0;         // INTCON register > GIE bit = 1 and PEIE bit = 1.
}// Timer0
// Prescaler 1:1
// TMR0 Preload = 56
// Interrupt time : 100 uS (0,1 mS)void Init_Timer0()
{
OPTION_REG = 0x88;     // PSA bit = 1 > Prescaler is assigned to WDT > Prescaler = 1:1
                       // RBPU bit = 1 > PORTB pull-up resistors are disabled.
TMR0 = 56;
INTCON = 0xA0;
}void Interrupt()
{
if (TMR1IF_bit = 1)
   {
    TMR1IF_bit = 0;
    TMR1H = 0x63;
    TMR1L = 0xC0;
    portd.b0 = 1;
    TMR0IF_bit = 0;
   }
if (TMR0IF_bit = 1)
   {
    cnt ++;
    TMR0IF_bit = 0;
    TMR0 = 56;
   }
}void main()
{
ANSEL = 0;
ANSELH = 0;
C1ON_bit = 0;
C2ON_bit = 0;
TRISD = 0;             // PORT D configuré en sortie.
PORTD = 0;             // Initialisation du PORT D à 0. Init_Timer1();
Init_Timer0(); do
{
  if (cnt = 10)
     {
      portd.b0 = 0;
      cnt = 0;
     }
}
while(1);
}