PIC32MK如何在ISR中修改寄存器？

我想用两个引脚来检查PWM同步应用我的示波器。这是一些代码：…………SuxTynLyNeababl中断（）；/全局中断使能ContButs.MVEC＝1；/ /设置多向量模式的中断控制器……SETBIT（LATF，0）；SETBIT（LATF，1）；//！初始值…ValuyO.ISR（pWMPiRixValuy，IPL1SO）PWMPRI1HANDLE（空隙）//pWM1y向量＝171 {…LATFCLR= 0x3；//LIFFITS.LATF0＝0；……CrRIT（IFS5，13）；} F0和F1总是被设置，并且我确信ISR被执行。WD也是OF//DeFCFG1，Pracl配置，FNOSCC＝SPLL，DMtiMTV= WiNe127L128，FSCONEN＝OFF，ISOO＝α-PrAPMA配置，POSCMOD= HS，FCKSM＝CSECME，WDTPS＝PS1048 57 6μ* Prima配置，WDTSSPGM＝停止，Wiste=正常，FWDTEN= OFF，FWDSTWSNZ＝WiSZZ25 25πPracMA配置DMCTNT＝DMT31，FDMTEN。这个谢谢你的帮助。



      以下为原文

    I would like to use two pins to check PWM's synchronization applying my oscilloscope.
That are some lines of code:
.....
__builtin_enable_interrupts();  // global interrupt enable  
INTCONbits.MVEC = 1; // Set the interrupt controller for multi-vector mode
........
SETBIT(LATF,0);   SETBIT(LATF,1);   //! Initialvalue
......

void __ISR(_PWM_PRI_VECTOR, IPL1SOFT) PwmPri1Handler(void) //_PWM1_VECTOR = 171
{
.......
LATFCLR = 0x3;
//LATFbits.LATF0 = 0;
.....
CLRBIT(IFS5,13);
}
The pins F0 and F1 are always set and I'm sure that the ISR is executed. The WD is also OFF
// DEVCFG1
#pragma config FNOSC = SPLL, DMTINTV = WIN_127_128, FSOSCEN = OFF, IESO = ON
#pragma config POSCMOD = HS, OSCIOFNC = ON, FCKSM = CSECME, WDTPS = PS1048576   
#pragma config WDTSPGM =STOP,WINDIS = NORMAL, FWDTEN = OFF, FWDTWINSZ = WINSZ_25
#pragma config DMTCNT = DMT31, FDMTEN = OFF
Thanks for help.