madd.asm

串口通信 频率测量 EEPROM读写程序

       .include "c:\appnotes\2333def.inc"
          .org $000
           rjmp main         
           .org $007
           rjmp SPI_TXC               
          .org $00d
     MAIN:;********************************************************
          ; 
          ; initialize MCU system
          ;
           ser r16
           out DDRC,r16 ;portc is output mode and turn off all LEDS
           ldi r17,$df
           out SPL,r17         
           ldi r25,$80
           out SREG,r25 ;enable globle interrupt                      
           ldi r25,0b00001100
           out MCUCR,r25; set INT! low level trigger        
           ldi r20,$00
           out ADCSR,r20    ;Disnable ADC     
           ldi r17,$08
           out WDTCR,r17;enable wacthdog
           wdr          ;reset wachdog                                     
           sbi DDRB,3    ;set MOSI(PB.5) output mode whwn SPI is master.
           sbi DDRB,5    ;set SCK (PB.7) output mode when SPI is master
           sbi DDRB,2    ;set SS output mode so that this byte cann't
                         ;influence SPI master work mode .
           ldi r17,0b11111100
           out SPCR,r17  ;set SPIE,SPE,MSTR,CPOL,CPHA ,reset the others
          ; ldi r25,$80  
          ; out GIMSK,r25 ;enable INT!   
        ;***********************************************************