PIC Basic Code Understanding

[aratti]

Define LCD registers and bits
Define LCD_DREG PORTD
Define LCD_DBIT 4
Define LCD_RSREG PORTE
Define LCD_RSBIT 0
Define LCD_EREG PORTE
Define LCD_EBIT 1

Here you define the pin port that you will use to drive your LCD display.

adval.highbyte = ADRESH ' Move HIGH byte of result to adval
adval.lowbyte = ADRESL ' Move LOW byte of result to adval

adval is a word variable (16 bits) and you load this variable in two steps copying two single bytes (adval.highbyte = ADRESH will transfer the high byte) and ( adval.lowbyte = ADRESL will transfer the low byte)

Al.