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diff --git a/Bachelor/Mikroprozessorsysteme2/mi2/Termin2/Termin2Aufgabe4a.c b/Bachelor/Mikroprozessorsysteme2/mi2/Termin2/Termin2Aufgabe4a.c
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--- /dev/null
+++ b/Bachelor/Mikroprozessorsysteme2/mi2/Termin2/Termin2Aufgabe4a.c
@@ -0,0 +1,58 @@
+// Lösung zu Termin2
+// Aufgabe 4
+// Namen: __________; ___________
+// Matr.: __________; ___________
+// vom :  __________
+//
+#include "pio.h"
+#include "pmc.h"
+#include "aic.h"
+
+StructPMC* myPMC = PMC_BASE;
+StructAIC* myAIC = AIC_BASE;
+StructPIO* myPIOB = PIOB_BASE;
+
+void taste_irq_handler (void) __interrupt__ ((interrupt));
+
+void taste_irq_handler (void)
+{
+	// do the things here
+	
+	// necessary??
+	//myPIOB->PIO_ISR;											// Read Interrupt Status Register to enable
+																				// Interrupt again
+																				
+	// switch LED1
+
+	myAIC->AIC_EOICR = 0x00000000; 				// Write to End of Interrupt Command Register  
+																				// to signal end of Interrupt Service Routine
+}
+
+int main(void)
+{	
+	myPMC->PMC_PCER = 0x14; 								// Clock PIO B
+	
+	// Initialize PIOB
+	myPIOB->PIO_PER = KEY1|KEY2|LED1|LED2;  // Enable PIO for SW1,SW2,LED1,LED2
+	myPIOB->PIO_OER = LED1|LED2;						// Set LED1 and LED2 as output
+	myPIOB->PIO_CODR = 0x000000FF;					// Clear Output Data Register
+	
+	// Enable Interrupts in CPU
+	// done by OS
+	
+	// Enable Interrupt for PIOB in AIC
+	//myAIC->AIC_SMR[] = ;								 // which register? what to put in it?
+	//myAIC->AIC_SVR[]= taste_irq_handler  // Address of Interrupt handling routine...
+	
+	myAIC->AIC_IECR	= PIOB_ID;							// Enable Interrupt for PIOB
+	
+	// enable PIOB Interrupt
+	//myPIOB->PIO_IER  = ; 									// what to put here? 
+	
+	// loop to infinity
+	while(1)
+	{
+	}
+	
+	return 0;
+}