Basic programming summary of the PIC microcontroller, beginners must see

"It is suitable for 3epic test board. The sales service of Aijing products is not good. Many C programs are written by ourselves, but it is good to refer to the assembler. ;------------------------------------------------------------------------------------------ ; Single and double bit transformation display experiment reference program note: please execute this program in one step (Experiment 1-1. ASM) ;------------------------------------------------------------------------------------------ STATUS EQU03H; Special function register definition TRISD EQU88H; Special function register definition PORTD EQU08H; Special function register definition TRISE EQU89H; Special function register definition PORTE EQU09H; Special function register definition ORG0000H; Reset address NOP; MPLAB specific statement STBSFSTATUS，5; Selector 1 CLRFTRISD; Portd set to output CLRFTRISE; Port set to output BCFSTATUS，5; Select volume 0 BCF PORTE，0; Re0 reset, strobe LED LOOPMOVLWB‘10101010’ MOVWFPORTD; Sets the value of portd MOVLWB‘01010101’ MOVWFPORTD; Set the portd value again GOTOLOOP; Cyclic operation ;------------------------------------------------------------------------------------------ END ;------------------------------------------------------------------------------------------ Reference address: http://www.21ic.com/app/mcu/201810/786583.htm ;------------------------------------------------------------------------------------------ ; Software delay automatic counting experiment reference program (Experiment 1-2. ASM) ;------------------------------------------------------------------------------------------ STATUS EQU03H ; Special function register definition TRISD EQU88H; Special function register definition PORTDEQU08H; Special function register definition TRISE EQU89H; Special function register definition PORTEEQU09H; Special function register definition ORG0000H; Reset address NOP; MPLAB specific statement STBSFSTATUS，5; Selector 1 CLRF TRISD; Portd set to output CLRF TRISE; Port set to output BCFSTATUS，5; Select volume 0 CLRF PORTD; Portd reset BCF PORTE，0; Re0 reset, strobe LED LOOPCALL DELAY1S; Call 1s delay program INCF PORTD; PORTD+1 GOTO LOOP; Cyclic operation ;------------------------------------------------------------------------------------------ ; 1 second delay subroutine reference program ;------------------------------------------------------------------------------------------ DELAY1S MOVLW 06H; External circulation constant MOVWF 20H; Outer loop register LOP0MOVLW 0EBH; Medium cycle constant MOVWF 21H; Medium cycle register LOP1MOVLW 0ECH; Internal circulation constant MOVWF 22H; Inner loop register LOP2DECFSZ 22H; Inner loop register decrement GOTO LOP2; Continue internal circulation DECFSZ 21H; Cyclic register decrement GOTO LOP1; Continue the middle cycle DECFSZ 20H; Outer loop register decrement GOTO LOP0; Continue external circulation RETURN; return ;------------------------------------------------------------------------------------------ END ;------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ ; Neon display experiment reference procedure (Experiment 1-3. ASM) ;------------------------------------------------------------------------------------------ STATUS EQU03H; Special function register definition TRISD EQU88H; Special function register definition PORTDEQU08H; Special function register definition TRISE EQU89H; Special function register definition PORTEEQU09H; Special function register definition PCLEQU02H; Special function register definition COUNTEREQU30H; Custom variable ORG0000H; Reset address NOP; MPLAB specific statement STBSFSTATUS，5; Select data memory body 1 CLRF TRISD; Define Rd port as output CLRF TRISE; Port set to output BCFSTATUS，5; Select data storage body 0 CLRF PORTD; Portd reset BCF PORTE，0; Re0 reset, strobe LED POPCLRF COUNTER; Custom variable counter 0 LOOPMOVF COUNTER，0; Take out the value of variable counter CALL TABLE; Look up table corresponding data MOVWF PORTD; Output from portd CALL DELAY50MS; Call 50ms delay INCF COUNTER，1; Cyclic variable increment MOVF COUNTER，0; Get the current counter variable value SUBLW .20; Has 20 data been taken out BTFSC STATUS，2; Check Z flag bit GOTO POP; Z = 1, indicating the end of a cycle, and counter resets again GOTO LOOP; Return to continue ;------------------------------------------------------------------------------------------ ; Data sheet content ;------------------------------------------------------------------------------------------ TABLE ADDWFPCL，1; Review offset RETLWB‘00011000’; The 0th display state RETLWB‘00111100’ ; The first display state RETLWB‘01111110’ ; The second display state RETLWB‘11111111’ ; The third display state RETLWB‘01111110’ ; The fourth display state RETLWB‘00111100’; 5th display state RETLWB‘00011000’ ; 6th display status RETLWB‘00000000’; 7th display state RETLWB‘10000001’ ; 8th display state RETLWB‘11000011’; 9th display status RETLWB‘11100111’ ; 10th display state RETLWB‘11111111’; 11th display state RETLWB‘11100111’ ; 12th display state RETLWB‘11000011’; 13th display state RETLWB‘10000001’ ; 14th display state RETLWB‘00000000’; 15th display state RETLWB‘11111111’; 16th display state RETLWB‘00000000’; 17th display state RETLWB‘11111111’; 18th display state RETLWB‘00000000’; 19th display state ;------------------------------------------------------------------------------------------ ; 50ms software delay subroutine ;------------------------------------------------------------------------------------------ DELAY50MS MOVLW 41H; External circulation constant MOVWF 20H; Outer loop register LOOP1 MOVLW 0FFH; Internal circulation constant MOVWF 21H; Inner loop register LOOP2DECFSZ 21H; Inner loop register decrement GOTO LOOP2 ; Continue internal circulation DECFSZ 20H; Outer loop register decrement GOTO LOOP1 ; Continue external circulation RETURN; return ;------------------------------------------------------------------------------------------ END ;------------------------------------------------------------------------------------------ ;------------------------------------------------------------------------------------------ ; Dynamic digital automatic counting and display experiment reference program (Experiment 2-1. ASM) ;------------------------------------------------------------------------------------------ LISTP=16F877A INCLUDE“P16F877A.INC”; Header file settings ;------------------------------------------------------------------------------------------ ; Definition of BAW, SHW, gew and counter variables COUNTEREQU71H; The number of variables that can be used for a loop QWEQU7CH; Can be used for decimal thousand variables BAWEQU7DH; Can be used for decimal hundred variables SHWEQU7EH; Can be used for decimal ten digit variables GEWEQU7FH; Can be used for decimal bit variables ;------------------------------------------------------------------------------------------ ORG0000H; Reset address NOP; MPLAB specific statement