Slow rise in LCD port

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Slow rise in LCD port

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akhilprasad
Contributor III

I have configured LCD module in MPC5604s. When I am connecing the LCD segment pins to CRO I could find a slow rise in the output signal. why is it so and can you suggest any method to rectify this issue.I have configured the port as special function and Pull up enabled, Am I missing any port configuration ?

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lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi,

which pin exactly? What is connected to the pin? What does it mean "slow rise"?

Regards,

Lukas

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akhilprasad
Contributor III

MPC5604s is connected with LCD module. LCD module has 5 LCD segments and 4 COM pins, this is mapped to certain pins in controller.

please find the wave form I am getting.

Yellow color(top) shows the waveform from COM and green color(bottom) shows the wave from segments.

I have tried with pullup and without pullup but the small spikes still exist.

This spike is only for the pins connected from COM not for the segments. Kindly guide me to solve the issue.

pastedImage_2.jpg

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