AT89S51-HD44780-4BITS

Matheus Peschke
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Demonstration of a connection between a HITACHI 44780 LCD Controller module and an Atmel AT89S51 MCU. Code available at https://github.com/mpeschke/hd44780_for_sdcc_51 Although the 8-bit multiplexer and EEPROM chips show on the project's picture, notice that this circuit is using the MCU's internal flash (EA=Vcc).
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AT89S51-HD44780-4BITS-EXT-EEPROM
AT89S51-HD44780-4BITS-EXT-EEPROM

Matheus Peschke

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Published: May 27, 2023 In development

Project Description

Project description

HD44780_FOR_SDCC_51 github project.

The LCD 1602A module, version 3, with a 4 bit interface, no external EEPROM.

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Component (11)
Qty
Description
Resistor

R4, R5

2
Generic Resistor (33KΩ)
1N4007

D1, D2

2
General Purpose Rectifier
Capacitor

C1, C2

2
Generic Capacitor (Non-Polarized) (27pF)
NE555P

U13

1
555 Type, Timer/Oscillator (Single) IC 100kHz 8-DIP (0.300", 7.62mm)

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