LCD_V2 - LCD Display 4-bit Interface (Version 2)...

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Introduction 1. The difference between 4 bit and 8 bit operation is that data is sent out as nibbles instead of as one byte. 2. D3:0 are not used on the LCD when the module is operated in 4-bit mode and D7:4 are used to transfer nibbles to/from the LCD module. Note: D7 is the MSB. 3. Commands and data are still 8 bits long, but are transferred as mentioned above as two 4-bit nibbles on data bus lines D7:4. 3. The most significant nibble should be transferred first, followed by the least significant nibble. 4. The optimal contrast for the LCD is 3.3 - 3.7V. Device Pin-out Pin Number Symbol Type Function 1 Vss - GND 2 Vcc - +5V 3 Vee Analog Input contrast adjust, see #4 above 4 RS Input 0 = command input/output, 1 = data input/output 5 R/W Input 0 = write to LCD module, 1 = read from LCD module 6 EN Input enable signal (data strobe) 7 DB4 I/O data bit 8 DB5 I/O data bit 9 DB6 I/O data bit 10 DB7 I/O data bit
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This document was uploaded on 07/11/2011.

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LCD_V2 - LCD Display 4-bit Interface (Version 2)...

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