opcodexch.java

来自「這是一個8051的模擬器 以java寫成」· Java 代码 · 共 24 行

/**
 * Projet de langage JAVA IFITEP 3 2005 - Simulateur 8051 
 * <p> 
 * D閒inition de l'instruction XCH.
 * Cf.:
 *  - documentation technique 8051
 *  - Ouvrage "Microcontroleur 8051 et 8052", edition Dunod
 *  
 * @author Matthieu SIMON
 * @version 1.0 du 14/06/05
 */
public class OpcodeXCH extends Opcode {
	public void execute(CORE_CPU8051 cpu) throws OpcodeException {		
		int a, src;
		if(decodeAddressingMode(cpu.getCurrentLine().getOperand(1)) != CORE_CPU8051.ACC)
			throw new OpcodeException(this, "Bad Addressing Mode");
		if((src = decodeAddressingMode(cpu.getCurrentLine().getOperand(2))) == Integer.MAX_VALUE)
			throw new OpcodeException(this, "Bad Addressing Mode");
		a = CORE_CPU8051.internalDataMem[CORE_CPU8051.ACC];
		CORE_CPU8051.internalDataMem[CORE_CPU8051.ACC] = CORE_CPU8051.internalDataMem[src];
		CORE_CPU8051.internalDataMem[src] = (byte)a;
		cpu.incCyclesCount(1);
	}
}