PIC Programming

• PIC has five ports.
• Port A, Port B, Port C, Port D, Port E.
• PIC is an 8bit.
• Port pins can be accessed by.
  1. Bit instruction.
  2. Byte instruction.

Bit Instruction

• In bit instruction each port pins value assigned individually.
• Example
  In port0 3rd pin should keep high and 4th pin should keep low, it can be done in this way.
  1. P0_3=1; (High) // Port 0-3rd pin
  2. P0_4=0; (Low) // Port 0-4th pin

Byte Instruction

• In byte instruction we have to access entire port pins.
• Example
  In port 0 all pin should keep low.
  1. P0 = 0x00;
     0x0000|0000;
     0x 0 | 0 ; = 0x00.
  2. In port 0 MSB should keep high and LSB should keep low.
  3. P0=0xF0;
     0x1111|0000;
     0x F | 0 ; = 0xF0.

Binary Table

Byte Instruction

Example

• To access the port pin as an input and output we need to config microcontroller registers.
• We need to set the direction for pins by using the TRIS register.
• Port A Pins is accessed as output then TRISA=0x00.
• Port A Pins is accessed as input then TRISA=0xFF.