PIC24只产生一个输出脉冲

大家好，我正在使用一个PIC24EP256GP206，我想使用OC MODUL来产生一个输出脉冲内径比较单输出脉冲模式，每次从TMR2接收IRQ。如果我选择FCY作为OC1的输入时钟，它工作，但是当我选择TMR3作为输入时钟时，它只产生一个输出脉冲。我不理解原因。这是代码：这是IRQS代码：我也尝试了StunGoC1CON2BITS SysCSEL＝0x0D（time3同步或触发器），但没有变化。它为什么只工作iFiC1CONBITE？OCTSEL＝7？有人能帮我吗？谢谢



      以下为原文

    Hi All,
i'm working with a PIC24EP256GP206, I want to use OC modul to generate an output pulse in DUAL COMPARE SINGLE OUTPUT PULSE MODE, every time I receive an irq from TMR2.
If I select Fcy as input clock for OC1 it works, but when I choose TMR3 as input clock, it generates only one output pulse and I don't understand the cause.

This is the code:

// INITIALIZATION *******************************
// TMR2
TMR2 = 0;
T2CONbits.TSIDL = 0;
T2CONbits.TGATE = 0;
T2CONbits.TCKPS = 3; // Prescaler = 256
T2CONbits.TCS = 0;
IPC1bits.T2IP = 4;
IFS0bits.T2IF = 0;
IEC0bits.T2IE = 1;
PR2 = 7725; //25 ms/40Hz
//***********************************************
// TMR3 (input clock for OC1)
TMR3 = 0;
T3CONbits.TSIDL = 0;
T3CONbits.TGATE = 0;
T3CONbits.TCKPS = 1;
T3CONbits.TCS = 0;
T3CONbits.TON = 0;

//***********************************************
// OC1 (Output compare)
OC1CON1 = 0;
OC1CON2 = 0;
RPOR1bits.RP37R = 0x10;

OC1CON1bits.OCTSEL = 1; // Source = Timer3
OC1R = 2000;
OC1RS = 2500;

OC1CON2bits.SYNCSEL = 0;
OC1CON2bits.OCTRIG = 0;
OC1CON2bits.TRIGSTAT = 0;

IPC0bits.OC1IP = 1;
IFS0bits.OC1IF = 0;
IEC0bits.OC1IE = 1;

PR3=OC1RS+2;
T2CONbits.TON = 1;


This is the IRQs code:
void __attribute__((interrupt, no_auto_psv)) _T2Interrupt(void){

    TMR2 = 0;
    TMR3 = 0;
   
    OC1TMR = 0;
    OC1CON1bits.OCM = 4;      // ReARM a new output pulse
    T3CONbits.TON = 1;
   
    IFS0bits.T2IF = 0;
}

void __attribute__((interrupt, no_auto_psv)) _OC1Interrupt(void){
   T3CONbits.TON = FALSE;
    IFS0bits.OC1IF = 0;
}


I tried also setting OC1CON2bits.SYNCSEL = 0x0D (Timer3 synchronizes or triggers)  but nothing change.
Why does it work only if OC1CON1bits.OCTSEL=7 ?

Can anyone help me?
Thanks