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LCD segment addressing problem with the MCF51EM128CLL MCU

Question asked by Clive Buxton on Feb 3, 2016
Latest reply on Feb 14, 2016 by TomE

Has anyone had any issues addressing a segmented LCD display from a  MCF51EM128CLL ?

We are having an issue whereby some of the chosen segments are not responding as programmed to the LCD registers

and we sometimes and unpredictably see an inversion of the chosen segment or segments on other backplanes seem to be changed.

Unfortunately the chip does not allow us to read back the register contents which would be a great help.

We have successfully completed a similar product using the MC9S08LL64CLH without the same problem.

We are suspecting a possible timing problem but any help would be appreciated!