38 lines
1007 B
Java
38 lines
1007 B
Java
package de.darkress.pic16f84sim.commands;
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import de.darkress.pic16f84sim.microcontroller.Cycles;
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import de.darkress.pic16f84sim.microcontroller.Memory;
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import de.darkress.pic16f84sim.microcontroller.ProgramCounter;
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public class Rrf extends FileRegisterCommandUtils implements Command
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{
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private final int address;
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private final boolean destinationBit;
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public Rrf(int input)
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{
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address = input & 0x007F;
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destinationBit = checkDestinationBit(input);
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}
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@Override
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public void execute()
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{
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ProgramCounter.incPC();
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Cycles.incCycles();
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int register = Memory.getRegister(address);
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int newCarry = register & 0x01;
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int oldCarry = Memory.getCarryBit();
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register = (oldCarry << 7) + (register >>1);
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if(newCarry == 1)
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{
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Memory.setCarryBit();
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} else if(newCarry == 0){
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Memory.clearCarryBit();
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}
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writeToDestination(destinationBit, address, register);
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}
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}
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