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PmodCLS™ Reference Manual
Revised April 8, 2016
This manual applies to the PmodCLS rev. D-E
Overview
The Digilent PmodCLS is a 16x2 character LCD module driven by an Atmel®
ATmega48
microcontroller.
Features include:
The PmodCLS.
16×2 liquid crystal character display
Wide range of instruction functions
Up to 32 user definable characters
Multiple communication options including
UART, SPI, and I²C
Small PCB size for flexible designs 1.8“ ×
3.8” (4.6 cm × 9.7 cm)
Two 1×6-pin Pmod ports with SPI and UART
interfaces
Library and example code available in
resource center
1
Functional Description
The PmodCLS module can be used to display important information during program development or as a user
interface after the project has been completed. The module is ideally suited for microcontroller boards but can
also be used in projects using a FPGA board.
The module is capable of executing a variety of instructions such as erasing specific characters, setting different
display modes, scrolling, and displaying user-defined characters. These instructions are specified using escape
sequences to send commands to the board’s embedded Atmel ATmega48 microcontroller. The display on the
module is driven by this AVR and controls all of the features of the board.
2
Interfacing with the Pmod
The PmodCLS can communicate with the host board through the SPI, I
2
C, and UART ports.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
DOC#: 502-092
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PmodCLS™ Reference Manual
Through these protocol standards, users are able to set the cursor location and send other instructions by sending
escape sequences. And escape sequence is specified by first sending the escape character (0x1B) followed by a left
square bracket '[' (0x5B), and then one or more numeric parameters followed by the command character for the
specific command. Feel free to use our provided
example code.
Header J1
Pin
1
2
3
4
5
6
Signal
SS
MOSI
MISO
SCK
GND
VCC
Description
Slave Select
Master-Out-Slave-In
Master-In-Slave-Out
Serial Clock
Power Supply Ground
Positive Power Supply (3.3V)
Pin
1
2
3
4
5
6
Signal
SCL
SDA
TXD
RXD
GND
VCC
Header J2
Description
Serial Clock
Serial Data
Transmit Data
Receive Data
Power Supply Ground
Positive Power Supply (3.3V)
Table 1. J1 pinout description table.
Table 2. J2 pinout description table.
Figure 1. PmodCLS block diagram.
2.1
Communication Protocol Selection
You can set the board's communication method by setting the mode jumpers MD0, MD1, and MD2 on the board.
Possible mode jumper configurations are listed in Table 3 below. For rev. D boards, a missing jumper is
represented by a '0' and a connected jumper is represented by '1'. For rev. E boards, a missing jumper is
represented by a '1' and a connected jumper is represented by a '0'.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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PmodCLS™ Reference Manual
MD2, MD1, MD0
0,0,0
0,0,1
0,1,0
0,1,1
1,0,0
1,0,1
1,1,0
1,1,1
Protocol
UART
UART
UART
UART
TWI
TWI
SPI
Specified in EEPROM
Details
2400 baud
4800 baud
9600 baud
Baud rate in EEPROM
Address: 0x48
Address in EEPROM
Specified in EEPROM
Table 3. Mode jumper configurations.
Any external power applied to the PmodCLS must be within 2.7V and 5.5V; if you are powering the Pmod from its
VCC pin, you must operate the Pmod at 3.3V in order for the on-board step-up switching regulator to work
correctly.
3
Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1.8 inches long on the sides parallel to the pins on
the pin header and 3.8 inches long on the sides perpendicular to the pin header.
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
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