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The On Board Liquid Crystal Display (OBLCD) is supported with a comprehensive set of instructions for text and numeric display. The OBLCD is fully documented in the OBLCD guide.
The LCD instructions are actually composite instructions that get compiled by SPLat/PC. When SPLat/PC sees one of these instructions it translates it into several low level instructions, including ones that communicate with the LCD via the UV registers (see SPLat expansion framework). You don't have to worry about the details other than to be aware that these instructions will consequently modify UV.