Using PIC16F887 I/O to drive external devices

I’ve done a small addition to circuit on the previous circuit.I’m going to use LCD display I added there,to debug my project too.I’m taking out 6 I/O pins from the PIC16F877 via a connector to the breadboard.

Here is the modification to the previous schematic.

I have written a sample code to check the functionality of the I/O pins by setting them to be ‘0’ logic level.The configuration bits are same as for the previous post. Note that the changes are in bold.

sbit LCD_RS at RB5_bit; sbit LCD_EN at RB4_bit; sbit LCD_D4 at RB3_bit; sbit LCD_D5 at RB2_bit; sbit LCD_D6 at RB1_bit; sbit LCD_D7 at RB0_bit; sbit LCD_RS_Direction at TRISB5_bit; sbit LCD_EN_Direction at TRISB4_bit; sbit LCD_D4_Direction at TRISB3_bit; sbit LCD_D5_Direction at TRISB2_bit; sbit LCD_D6_Direction at TRISB1_bit; sbit LCD_D7_Direction at TRISB0_bit; void main() {     osccon = 0x70;     ansel  = 0;     anselh  = 0;     trisa = 0;     trisb = 0;     trisc = 0;     trisd = 0;     Lcd_Init();   Lcd_Cmd(_LCD_CLEAR);   Lcd_Cmd(_LCD_CURSOR_OFF);   Lcd_Out(1,1,"www.incredible");   Lcd_Out(2,1,"diy.com");     porta.f7=0;   porta.f6=0;   portc.f0=0;   portc.f1=0;   portc.f2=0;   portc.f3=0;   portd.f0=0;   portd.f1=0;     for(;;){   portd.f4=1;     delay_ms(1000);   portd.f4=0;   delay_ms(1000);   }     }

Here’s how to use the circuit with the breadboard