key1.asm

凌阳unsp

.define		P_IOA_DATA  	    0x7000
.define		P_IOA_DIR   	    0x7002 
.define		P_IOA_ATTRI			0x7003
.define		P_IOB_DATA  	    0x7005
.define		P_IOB_DIR   	    0x7007
.define		P_IOB_ATTRI			0x7008

.external ClearWatchDog
.ram
.var first,last,keyword;

.code
.public _key_asm1

_key_asm1:
  r1=0xff0f;
		[P_IOA_DIR]=r1 ;
   
    r1=0xff00;
		[P_IOA_ATTRI]=r1   ;        
	
	r1=0x0000;
		[P_IOA_DATA]=r1;

   r1=[P_IOA_DATA];
   [last]=r1;
   ////////////////////////////////
  r1=[last];
	nop
	nop
call ClearWatchDog
   retf;
   
reset: 
       nop;
       nop;
     
  	   retf;
   ///////////////////////////////
 
// aa_wait:
 //  jmp aa_wait; 
 
// aa_wait:
 //  jmp aa_wait;