50 lines
1.1 KiB
Java
50 lines
1.1 KiB
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 Sublw extends LiteralCommandUtils implements Command
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{
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private final int literal;
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public Sublw(int input)
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{
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literal = input & 0x00FF;
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}
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@Override
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protected void checkCarryBit(int result)
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{
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if(result <= 255){
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Memory.clearCarryBit();
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} else{
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Memory.setCarryBit();
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}
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}
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@Override
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protected void checkDigitCarryBit(int literal)
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{
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if(((literal & 0x0F) - (Memory.workingRegister & 0x0F)) < 0){
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Memory.clearDigitCarryBit();
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} else{
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Memory.setDigitCarryBit();
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}
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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 result = literal - Memory.workingRegister + 256;
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checkZeroBit(result);
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checkCarryBit(result);
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checkDigitCarryBit(literal);
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Memory.workingRegister = result % 256;
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}
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}
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