pic LM032

Posted on Feb 5, 2014

This page is about an old LM032L LCD module from Hitachi. I found an old one and tried to make it work. The module can display 2 lines with 20 characters each. This page will describe how I got the module to work on a PIC 16F84A microcontroller. First I had to find the datasheet for the LM032L LCD, which is no big deal when you use Google. The dat

pic LM032
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asheet will show you how to connect the LCD module. It turned out the LM032L has 14 connections: 8 data lines (DB0. DB7), the power supply (Vss, Vdd, Vo) and some additional control lines (RS, RW, E). So our module uses 8 parallel lines to send data to it. We can also use it with only 4 lines of data, this saves us some I/O lines on the PIC microcontroller. In this 4-bit mode each byte is transmitted in two phases: first the 4 upper bits are transmitted, then the the 4 lower bits. THIS is the approach I will use for my LCD controller: the PIC16F84A only has 13 I/O pins. We can`t afford to use 11 of them just to control an LCD module. The datasheet of the LM032L does not tell us how to control the LCD module. This is because the LM032L uses another chip to do the actual controlling of the LCD module: the HD44780. This HD44780 has its own datasheet and counts no less than 59 pages! The information in this datasheet applies to the LM032L module as well. The LM032L module has 14 connections that can be soldered. The connections are not numbered but you can find the numbering in the datasheet of the LM032L. The image is not very clear but at the left of the module there are 14 soldering contacts, formed by 2 vertical rows with 7 connections each. The numbering #1 starts with the right connection of the last row. The used circuit is very easy. It is the basic implementation of the PIC16F84A: the chip is powered by applying 5 VDC...

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