dm642_key.s43

430单片机键盘扫描源码

#include  "msp430x12x.h"

            RSEG        CSTACK                              ; System stack
            DS          0
            
            RSEG         UDATA0                             ; RAM Locations
            
            RSEG         CODE                               ; CODE Locations
            
Reset       mov         #SFE(CSTACK),SP                     ; Initialize stackpointer
SetupWDT    mov         #WDTPW+WDTHOLD,&WDTCTL              ; Stop WDT
SetupPorts  mov.b       #0f0h,&P1DIR                        ; Unused P1.x as Outputs        
            mov.b       #0ffh,&P2DIR                        ; Unused P2.x as outputs
            mov.b       #0ffh,&P3DIR                        ; All P3.x as outputs
            
            eint                                            ; Enable Interrupts
            
                                                           
;------------------------------------------------------------------------------ 
;           Interrupt Vectors Used MSP430x12x(2)         
;------------------------------------------------------------------------------ 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      Reset                   ; 
            END     

END