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Source Code For Resistors

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Hello, i has uploaded the source code in C++ for a program that i hava made, see how it works. To detect a change in the data lines you have to conect it to gnd, because they have a pull up resistor, i have used a 74ls244 to isolate the port.
hi i saw some codes like these for pic16f84 ORG 0 PowerOn BSF STATUS,RP0 ;Select file bank 1 MOVLW H'00' MOVWF TRISB ;Set all PORTB bits as outputs (display driver) MOVWF TRISA ;Set all PORTA bits as outputs (will be inputs in future version) MOVLW B'11010111' ;Turn off PORTB pullups, prescaler to TMR0, 1:256 scaling