opcodemov.java

這是一個8051的模擬器 以java寫成

/**
 * Projet de langage JAVA IFITEP 3 2005 - Simulateur 8051 
 * <p> 
 * D閒inition de l'instruction MOV.
 * Cf.:
 *  - documentation technique 8051
 *  - Ouvrage "Microcontroleur 8051 et 8052", edition Dunod
 *  
 * @author Matthieu SIMON
 * @version 1.0 du 14/06/05
 */
public class OpcodeMOV extends Opcode {
	public void execute(CORE_CPU8051 cpu) throws OpcodeException {
		int dest, src;
		if((dest = decodeAddressingMode(cpu.getCurrentLine().getOperand(1))) == Integer.MAX_VALUE)
			throw new OpcodeException(this, "Bad Addressing Mode");
		if((src = decodeAddressingMode(cpu.getCurrentLine().getOperand(2))) == Integer.MAX_VALUE)
			throw new OpcodeException(this, "Bad Addressing Mode");
		
		if(CORE_CPU8051.internalDataMem[CORE_CPU8051.BIT] < 8) { // adressage au niveau du bit
			if(dest == CORE_CPU8051.PSW) 
				CORE_CPU8051.internalDataMem[CORE_CPU8051.PSW] = (CORE_CPU8051.internalDataMem[CORE_CPU8051.DPH]&0x7F) |
					CORE_CPU8051.internalDataMem[src] & (1<<CORE_CPU8051.internalDataMem[CORE_CPU8051.BIT]);
			else
				CORE_CPU8051.internalDataMem[dest] = CORE_CPU8051.internalDataMem[dest]&(~(1<<CORE_CPU8051.internalDataMem[CORE_CPU8051.BIT])) |
					(CORE_CPU8051.internalDataMem[CORE_CPU8051.PSW]&0x80);
			CORE_CPU8051.internalDataMem[CORE_CPU8051.BIT] = 8;
		}
		else if(dest == CORE_CPU8051.DPTR) {
			CORE_CPU8051.internalDataMem[CORE_CPU8051.DPH] = ((CORE_CPU8051.internalDataMem[src]>>8)&0xFF);
			CORE_CPU8051.internalDataMem[CORE_CPU8051.DPL] = ((CORE_CPU8051.internalDataMem[src]   )&0xFF);
		}
		else
			CORE_CPU8051.internalDataMem[dest] = CORE_CPU8051.internalDataMem[src];
		
		if(dest == CORE_CPU8051.SBUF)
			cpu.setSBUFWrite(true);
		
		if(dest != CORE_CPU8051.ACC && src != CORE_CPU8051.ACC)
			cpu.incCyclesCount(1);
		cpu.incCyclesCount(1);
	}
}