What is UART in PIC?
UART stands for Universal Asynchronous Receiver / Transmitter. It is a serial communication interface which uses two lines for sending (TX) and receiving (RX) data. Most of the Microchip’s PIC Microcontrollers have built in USART Module. USART stands for Universal Synchronous Asynchronous Receiver Transmitter.
How to interface UART with microcontroller?
UART communication is carried out using two lines Tx (transmission line) and Rx (reception line). It is possible to transmit and receive data simultaneously (full duplex) using UART interface. PIC microcontrollers possess (most of them) an inbuilt USART hardware which can be configured in three different modes.
What’s the difference between RS-232 and UART?
As I have understood the main difference between UART and RS-232 is voltage levels. And with PIC I cannot supply proper voltage level that is required for RS232. Because of that UART to RS232 converter’s look like a must. (i.e. MAX232) I have two questions. 1) Using UART to RS232 chips is the only option in this case?
How to use MAX232 to communicate between Pic and a PC?
A computer with Microchip’s MPLAB X IDE, with XC8 v1.34 compiler installed. (I’m using MPLAB X v3.05 and XC8 v1.34) Maxim Integrated Products created the MAX232 IC in 1987. It is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals from/to the PC’s serial port (which can reach up to 25 v) from/to TTL levels (5 v).
Which is RS232 level converter for PIC microcontroller?
A very famous RS232 level converter is the MAX232 chip. In the schematic below a PIC microcontroller is connected to the RS232 level converter chip. A PIC18F2620 micocontroller is used, but it will also work with any other microcontroller which has a built-in UART.
What is the serial port for a UART TX?
Your UART TX needs to connect to Logic Data Input pin of MAX232 (T1IN (Pin Number – 11) or T2IN (Pin Number – 10)). Your UART RX needs to connect to Logic Data Output pin of MAX232 (R1OUT (Pin Number – 12) or R2OUT (Pin Number – 9)).