opcodecjne.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 CJNE.
 * Cf.:
 *  - documentation technique 8051
 *  - Ouvrage "Microcontroleur 8051 et 8052", edition Dunod
 *  
 * @author Matthieu SIMON
 * @version 1.0 du 14/06/05
 */
public class OpcodeCJNE extends Opcode {
	public void execute(CORE_CPU8051 cpu) throws OpcodeException {
		int dest, octet;
		if((dest = decodeAddressingMode(cpu.getCurrentLine().getOperand(1))) == Integer.MAX_VALUE)
			throw new OpcodeException(this, "Bad Addressing Mode");
		if((octet = decodeAddressingMode(cpu.getCurrentLine().getOperand(2))) == Integer.MAX_VALUE)
			throw new OpcodeException(this, "Bad Addressing Mode");
		
		if(CORE_CPU8051.internalDataMem[dest] != CORE_CPU8051.internalDataMem[octet])
			relativeJump(cpu.getCurrentLine().getOperand(3), cpu);	
		
		CORE_CPU8051.internalDataMem[CORE_CPU8051.PSW] = ((CORE_CPU8051.internalDataMem[dest] < CORE_CPU8051.internalDataMem[octet]) ?
										CORE_CPU8051.internalDataMem[CORE_CPU8051.PSW] |   0x80 : 
										CORE_CPU8051.internalDataMem[CORE_CPU8051.PSW] & ~ 0x80  ) &0xFF;
		
		cpu.incCyclesCount(2);
	}
}