opcodeinc.java

来自「這是一個8051的模擬器 以java寫成」· Java 代码 · 共 29 行

/**
 * Projet de langage JAVA IFITEP 3 2005 - Simulateur 8051 
 * <p> 
 * D閒inition de l'instruction INC.
 * Cf.:
 *  - documentation technique 8051
 *  - Ouvrage "Microcontroleur 8051 et 8052", edition Dunod
 *  
 * @author Matthieu SIMON
 * @version 1.0 du 14/06/05
 */
public class OpcodeINC extends Opcode {	
	public void execute(CORE_CPU8051 cpu) throws OpcodeException {
		int tmp;
		if((tmp = decodeAddressingMode(cpu.getCurrentLine().getOperand(1))) == Integer.MAX_VALUE)
			throw new OpcodeException(this, "Bad Addressing Mode");
		
		if(tmp == CORE_CPU8051.DPTR) {			
			int a = ((CORE_CPU8051.internalDataMem[CORE_CPU8051.DPH]<<8)&0xFF00) | (CORE_CPU8051.internalDataMem[CORE_CPU8051.DPL]&0xFF) + 1;
			CORE_CPU8051.internalDataMem[CORE_CPU8051.DPH] = ((a>>8)&0xFF);
			CORE_CPU8051.internalDataMem[CORE_CPU8051.DPL] = ( a    &0xFF);
			cpu.incCyclesCount(1);
		}
		else
			CORE_CPU8051.internalDataMem[tmp] = (byte)(CORE_CPU8051.internalDataMem[tmp] + 1);
		
		cpu.incCyclesCount(1);
	}
}