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Microcontroller Programming with MikroC PRO for PIC
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<blockquote data-quote="Little DJ" data-source="post: 10919962" data-attributes="member: 320663"><p><strong>16x2 LCD with 16F877A</strong></p><p></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px">In this exercise lets look at how can we interface a LCD display with 16F877A PIC microcontroller. </span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px">The mikroC PRO for PIC provides a library for communication with LCDs (with HD44780 compliant controllers) through the 4-bit interface. </span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>HD44780 Pinout</strong></span></p><p><span style="font-size: 15px"></span></p><ol> <li data-xf-list-type="ol"><span style="font-size: 15px">Vss (Ground)</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">VCC (5V)</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">Contrast (use a potentiometer for variable contrast, or just connect to GND)</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">Register Select (RS), 0 = command write, 1 = data write</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">Read/Write (R/W), 0 = write to display, 1 = read from display</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">Enable (EN) - used to clock in data</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB0 (not used in 4-bit mode) - LSb</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB1 (not used in 4-bit mode)</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB2 (not used in 4-bit mode)</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB3 (not used in 4-bit mode)</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB4 - LSb in 4-bit mode</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB5</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB6</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">DB7 - MSb</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">Backlight + (5V)</span></li> <li data-xf-list-type="ol"><span style="font-size: 15px">Backlight - (GND)</span></li> </ol><p></p><p><span style="font-size: 15px"><strong>4-bit and 8-bit modes</strong></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px">An HD44780 LCD can be operated in two different modes: 4-bit mode and 8-bit mode. In 8-bit mode, pins 7-14 of the LCD are connected to eight I/O pins on the microcontroller; while in 4-bit mode, pins 11-14 on the LCD are connected to four I/O pins on the microcontroller. The advantage to operating in 8-bit mode is that the programming is a bit simpler and data can be updated more quickly. The obvious reason to operate in 4-bit mode is to save four I/O pins on the PIC microcontroller.</span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>Circuit Diagram for 16x2 LCD</strong></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><img src="http://3.bp.blogspot.com/-U9vx0OlVPfA/TmEYjmH3mqI/AAAAAAAAAIo/24C00WT6n3Q/s1600/16x2+LCD.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>Complete Circuit Diagram with PIC Microcontroller</strong></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><img src="http://4.bp.blogspot.com/-52hKTA-k1dE/TmEZKNHPFOI/AAAAAAAAAIs/J03gVXK9_D0/s1600/16x2+LCD.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"> </span></p><p><span style="font-size: 15px"><strong> To get MikroC Code & PROTUES Design:</strong> <a href="http://www.electronicworkspace.com/2011/09/16x2-lcd-with-16f877a.html" target="_blank"><strong>Click Here</strong></a></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"></span></p></blockquote><p></p>
[QUOTE="Little DJ, post: 10919962, member: 320663"] [b]16x2 LCD with 16F877A[/b] [SIZE="4"] In this exercise lets look at how can we interface a LCD display with 16F877A PIC microcontroller. The mikroC PRO for PIC provides a library for communication with LCDs (with HD44780 compliant controllers) through the 4-bit interface. [B]HD44780 Pinout[/B] [LIST=1] [*]Vss (Ground) [*]VCC (5V) [*]Contrast (use a potentiometer for variable contrast, or just connect to GND) [*]Register Select (RS), 0 = command write, 1 = data write [*]Read/Write (R/W), 0 = write to display, 1 = read from display [*]Enable (EN) - used to clock in data [*]DB0 (not used in 4-bit mode) - LSb [*]DB1 (not used in 4-bit mode) [*]DB2 (not used in 4-bit mode) [*]DB3 (not used in 4-bit mode) [*]DB4 - LSb in 4-bit mode [*]DB5 [*]DB6 [*]DB7 - MSb [*]Backlight + (5V) [*]Backlight - (GND) [/LIST] [B]4-bit and 8-bit modes[/B] An HD44780 LCD can be operated in two different modes: 4-bit mode and 8-bit mode. In 8-bit mode, pins 7-14 of the LCD are connected to eight I/O pins on the microcontroller; while in 4-bit mode, pins 11-14 on the LCD are connected to four I/O pins on the microcontroller. The advantage to operating in 8-bit mode is that the programming is a bit simpler and data can be updated more quickly. The obvious reason to operate in 4-bit mode is to save four I/O pins on the PIC microcontroller. [B]Circuit Diagram for 16x2 LCD[/B] [IMG]http://3.bp.blogspot.com/-U9vx0OlVPfA/TmEYjmH3mqI/AAAAAAAAAIo/24C00WT6n3Q/s1600/16x2+LCD.png[/IMG] [B]Complete Circuit Diagram with PIC Microcontroller[/B] [IMG]http://4.bp.blogspot.com/-52hKTA-k1dE/TmEZKNHPFOI/AAAAAAAAAIs/J03gVXK9_D0/s1600/16x2+LCD.JPG[/IMG] [B] To get MikroC Code & PROTUES Design:[/B] [URL="http://www.electronicworkspace.com/2011/09/16x2-lcd-with-16f877a.html"][B]Click Here[/B][/URL] [/SIZE] [/QUOTE]
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