The microcontroller PIC16F887 has a build in USART (Universal Synchronous/Asynchronous Receiver/Transmitter) module. This module can be used as UASAT or UART.
This small post shows an example for the usage of the UART protocol with PIC16F887 microcontroller.

After that we will build a demo project to explore the library. Finally we will burn this demo in a PIC16F877A and establish a serial communication with PC. Serial Communication. Their are several serial communication standards like RS232, SPI, I2C etc. Of which RS232 is a asynchronous method. That means it does NOT have a synchronizing clock line. PIC16F877A UART example with CCS C. This is a small example shows how to use PIC16F877A UART module using CCS PIC C compiler. Pin RC6 (TX) and pin RC7 (RX) are used for the UART (serial) communication between the microcontroller and the computer. To change between TTL logic levels (5V) and RS232 signals (+/-12V), an IC is needed which is max232. PIC serial communication tutorial Introduction to Serial communication with PIC16F877 microcontroller. CLICK here for a quick PIC serial communication tutorial. In this tutorial we will study the communication component – USART (Universal Synchronous Asynchronous Receiver Transmitter) located within the PIC. CCS C Compiler Example Programs Full List of Example Files. The CCS C compiler includes a library of example programs for many common applications. Each example program contains a header with instructions on how to run the example, and if necessary, the. Pin RC6 (TX) and pin RC7 (RX) are used for the UART (serial) communication between the microcontroller and the computer. To change between TTL logic levels (5V) and RS232 signals (+/-12V), an IC is needed which is max232. Don’t connect TX and RX pins directly to an RS232 serial port which may damage your microcontroller.

Hardware Required:

PIC16F887 microcontroller
MAX232 — datasheet
4 x 10uF polarized capacitor
Female COM port
Breadboard
5V power source
Jumper wires

UART Example for PIC16F887 circuit:

In this example the microcontroller PIC16F887 uses its internal oscillator and MCLR pin function is disabled.
The female COM port is connected to the PC using RS232 cable, this cable has to be male-female because the PC COM port is male.

UART Example for PIC16F887 CCS C code:
The code used in this example is shown below.
The function #use rs232(UART1, baud = 9600) is used to configure the UART protocol. Here the hardware UART module is used. If the pins TX and RX (RC6 and RC7) are used by an other application we can use software UART. Software UART is generated by the compiler with the same previous function. For example TX is mapped to pin RD0 and RX to pin RD1:
#use rs232(xmit = PIN_D0, rcv = PIN_D0, baud = 9600)
where 9600 is the baud rate.
The functions used in the C code are:
printf: sends a string of characters over RS232 transmission pin (TX).
putc: send a character over RS232 transmission pin (TX).
if(kbhit()): test if a character is ready for getc() function.
getc(): read the character.

</div><img src='https://www.profesionalreview.com/wp-content/uploads/2020/02/puerto-serie-02.png' alt='Comunicacion Serial Rs232 Pic Ccs' title='Comunicacion Serial Rs232 Pic Ccs' /><h2>Comunicacion Serial Rs232 Pic Ccs De</h2><table><tbody><tr><td><div><div>2</div><div>4</div><div>6</div><div>8</div><div>10</div><div>12</div><div>14</div><div>16</div><div>18</div><div>20</div><div>22</div><div>24</div><div>26</div><div>28</div><div>30</div><div>32</div><div>34</div></div></td><td><div><div><span>// CCS C UART example for PIC16F887 microcontroller</span></div><div><span>#include <16F887.h></span></div><div><span>#use delay(clock = 8MHz)</span></div><div><span>const</span><span>char</span><span>message</span><span>[</span><span>]</span><span>=</span><span>'PIC16F887 microcontroller UART example'</span><span>;</span></div><div><span>void</span><span>main</span><span>(</span><span>)</span><span>{</span></div><div><span>setup_oscillator</span><span>(</span><span>OSC_8MHZ</span><span>)</span><span>;</span><span>// Set internal oscillator to 8MHz</span></div><div><span>// Print text</span></div><div><span>// Print list of characters</span></div><div><span>while</span><span>(</span><span>message</span><span>[</span><span>i</span><span>]</span><span>!=</span><span>'0'</span><span>)</span><span>{</span></div><div><span>delay_ms</span><span>(</span><span>100</span><span>)</span><span>;</span><span>// Wait 100 ms</span></div><div><span>}</span></div><div><span>printf</span><span>(</span><span>'nr'</span><span>)</span><span>;</span><span>// Start new line</span></div><div><span>printf</span><span>(</span><span>'%unr'</span><span>,</span><span>i</span><span>)</span><span>;</span><span>// Print i and start new line</span></div><div><span>}</span></div><div><span>while</span><span>(</span><span>TRUE</span><span>)</span><span>{</span></div><div><span>j</span><span>=</span><span>getc</span><span>(</span><span>)</span><span>;</span><span>// UART read</span></div><div><span>}</span></div><div><span>}</span></div></div></td></tr></tbody></table><h2>Serial Rs232 To Usb</h2><p>After I build the circuit and burned the HEX file into the PIC16F887 using PICkit 3 programmer, I got a result as shown in this video (using CCS C Compiler IDE Serial Monitor tool):</p><br><br><a href='https://amebaownd.loadbybox.com/vida-dice-requirements.html#ua=V1AVEwcCWAZXEwZRAgUAUQ9RBg0aBVgORghZUlNWDwldShAEFg1QDx4UQVYBBx5GCloaVlUVG1ICVxwBHncPCFwMSDULFBpQGUoLSgAFBwdPDB0HGgNZTmY1HF1dVAIPXQYKDxcUWBFQSFMJV1dUWRRXVRtVCVpPHxJVSUZGQ1VSRFAANw==' target='_blank'><img src='https://d-peat.blog-app.download/img/10.png' style='cursor:pointer;display:block;margin-left:auto;margin-right:auto;'></a><br><br></article></body></html>