/** Check if Interrupt occurs, if yes, push PC to Stack & go to 0x4 */
public void checkInterrupt() {
if (interna.getInterrupt() && !isInterrupted) {
// isInterrupted = true;
this.getInterna().getPcstack().push(this.getPC());
this.setPC(0x4 - 1);
interna.clearBitAt(0xb, 7);
}
}
/**
* Bit of Port A is Clicked Checks TMR0 Source Select Bit & impulse edge
*
* @param column Bit of Port A
*/
private void portAClicked(int column) {
int bit = interna.getBitAtNoBank(0x5, 7 - column); // toggle bits
if (bit == 0) interna.setBitAt(0x5, 7 - column);
else interna.clearBitAt(0x5, 7 - column);
boolean oldV = (bit != 0);
boolean newV = (interna.getBitAtNoBank(0x5, 4) != 0);
if (column == 3 && interna.getBitAt(0x81, 5) == 1) { // TMR0 Clock Source Select Bit
if (interna.getBitAt(0x81, 4) == 1) { // inc high-to-low
if (!newV && oldV) {
interna.incTMR0();
}
} else { // inc low-to-high
if (newV && !oldV) {
interna.incTMR0();
}
}
}
updateGui();
}
/**
* A Bit of Port B is Clicked Checks Interrupt Bits and impulse edge
*
* @param column Bit of Port B
*/
private void portBClicked(int column) {
int bit = interna.getBitAtNoBank(0x6, 7 - column); // toggle bits
if (bit == 0) interna.setBitAt(0x6, 7 - column);
else interna.clearBitAt(0x6, 7 - column);
boolean oldB = (bit != 0);
boolean newB = (interna.getBitAtNoBank(0x6, 4) != 0);
if (interna.getBitAt(0xB, 7) == 1) { // GIE Enabled
if (interna.getBitAt(0xB, 3) == 1 && column <= 3) { // rb port changed
interna.setBitAt(0xB, 0);
} else if (interna.getBitAt(0xB, 4) == 1 && column == 7) { // rb0 interrupt
if (interna.getBitAt(0x81, 6) == 1) { // check interrupt-edge
if (newB && !oldB) {
interna.setBitAt(0xB, 1);
}
} else {
if (!newB && oldB) {
interna.setBitAt(0xB, 1);
}
}
}
}
updateGui();
}