LPC1788

hi dears

i use this code on keil v5.16a.
when i clear a register , the pin position dont chane to 0, and it stay o 1.
but in version 4.7 it works correctly.
thank you.

#include "LPC177x_8x.h"

#define t 2000

void Delay (uint32_t Time)
{ uint32_t i;

i = 0; while (Time--) { for (i = 0; i < 50; i++); }
}

int main (void)
{ // ---------------- Configuration ---------------

LPC_GPIO3->DIR = 1<<25 ; /* LEDs PORT3.25 are Output */ while(1) {

LPC_GPIO3->SET = 1<<25; Delay(t);

//LPC_GPIO3->DIR->CLR = 1<<25 ; LPC_GPIO3->CLR = 1<<25; Delay(t); }
}