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My problem is: I cannot read a Pin P1.26 inside a Timer-Interupt. MCU: LPC2368
// Initialization I/O IODIR1 = (1<<4); // P1.4 Output
Timer Interrupt 100us: P1.26 is toggling with 150Hz
__irq void T2_IRQHandler(void) { T2IR = 1; // Clear interrupt flag VICVectAddr = 0; // Acknowledge Interrupt //IOPIN1^=(1<<4); // this is toggling when enabled if(IOPIN1&(1<<26)==0) { IOPIN1^=(1<<4); // this NOT } }