03带按键音效的按键扫描实验例程,按K1～K4时

				### uVision2 Project, (C) Keil Software
				### Do not modify !
				
				Target (Target 1), 0x0000 // Tools: 'MCS-51'
				
				Group (Source Group 1)
				
				File 1,2,
				
				
				Options 1,0,0  // Target 'Target 1'
				 Device (AT89S51)
				 Vendor (Atmel)
				 Cpu (IRAM(0 - 0x7F) IROM(0 - 0xFFF) CLOCK(33000000) MODAT2)
				 Rgf (AT89X51.H)
				 Mem ()
				 C ()
				 A ()
				 RL ()
				 OH ()
				 UseEnv=0
				 EnvBin ()
				 EnvInc ()
				 EnvLib ()
				 EnvReg (