52 lines
1.3 KiB
Java
52 lines
1.3 KiB
Java
package de.darkress.pic16f84sim.commands;
|
|
|
|
import de.darkress.pic16f84sim.microcontroller.Cycles;
|
|
import de.darkress.pic16f84sim.microcontroller.Memory;
|
|
import de.darkress.pic16f84sim.microcontroller.ProgramCounter;
|
|
|
|
public class Subwf extends FileRegisterCommandUtils implements Command
|
|
{
|
|
private final int address;
|
|
private final boolean destinationBit;
|
|
|
|
public Subwf(int input)
|
|
{
|
|
address = input & 0x007F;
|
|
destinationBit = checkDestinationBit(input);
|
|
}
|
|
|
|
@Override
|
|
protected void checkCarryBit(int result)
|
|
{
|
|
if(result <= 255){
|
|
Memory.clearCarryBit();
|
|
} else{
|
|
Memory.setCarryBit();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void checkDigitCarryBit(int literal)
|
|
{
|
|
if(((literal & 0x0F) - (Memory.workingRegister & 0x0F)) < 0){
|
|
Memory.clearDigitCarryBit();
|
|
} else{
|
|
Memory.setDigitCarryBit();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void execute()
|
|
{
|
|
ProgramCounter.incPC();
|
|
Cycles.incCycles();
|
|
int result = Memory.getRegister(address) - Memory.workingRegister + 256;
|
|
|
|
checkZeroBit(result);
|
|
checkCarryBit(result);
|
|
checkDigitCarryBit(Memory.getRegister(address));
|
|
|
|
writeToDestination(destinationBit, address, result % 256);
|
|
}
|
|
}
|