HD44780 LCD and matrix keyboard

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Practice 2: LCD data on RD4-RD7 (4-bit), RS/E on RD2-RD3. Keyboard rows RB0-RB3, columns RB4-RB7.

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LCD and matrix keyboard

Based on: Clase Tema 7.1 Modulo LCD y 7.2 Teclado.pdf

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On HD44780 LCD, RS=0 means...

Send command Send character data Turn off contrast SPI mode

In Practice 2, keyboard interrupts use...

RB4-RB7 (PORTB change) RC6-RC7 UART INT0 only ADC GO/DONE

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