Author Topic: Minimal connections to drive T6963 LCD module  (Read 939 times)

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Offline CambridgeMartTopic starter

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Minimal connections to drive T6963 LCD module
« on: August 03, 2020, 07:01:55 pm »
I'm working on a project that has a single channel 12bit ADC and a display module; the cheapest way to get a 12 bit ADC and microcontroller appears to be the Arduino M0; I've found some reasonably priced variants with the STM32F003F4 microcontroller, but there appears to be only 13 IO lines. I have a nice T6963 module that I want to use, but the data indicates that 13 control / data lines are required, which I don't have. In such a minimal circuit, can lines such as CS and /RD be tied to a fixed voltage?
 

Offline ebclr

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Re: Minimal connections to drive T6963 LCD module
« Reply #1 on: August 03, 2020, 09:32:14 pm »
 

Offline coromonadalix

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Re: Minimal connections to drive T6963 LCD module
« Reply #2 on: August 03, 2020, 11:14:56 pm »
You can go down to 7 pins, i think with some shift registers

https://github.com/Orabig/Rasp-T6963C
 

Offline CambridgeMartTopic starter

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Re: Minimal connections to drive T6963 LCD module
« Reply #3 on: August 07, 2020, 01:07:50 pm »
Thanks coromonadalix, that's really useful.
 

Offline Scrts

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Re: Minimal connections to drive T6963 LCD module
« Reply #4 on: August 07, 2020, 02:00:00 pm »
the STM32F003F4 microcontroller, but there appears to be only 13 IO lines.

I understand that you've made a mistype and had STM32F030F4 in your mind? TSSOP20 package? In that case, based on STM32F030F4 datasheet page 10 Table 2, you can have 15 GPIOs. And indeed, if you look into page 27, you can count 15 GPIOs, however the only limitation is that you will have to utilize internal oscillator in order to free up 2 GPIOs PF0/PF1 that are otherwise dedicated to the external XTAL.
 

Offline CambridgeMartTopic starter

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Re: Minimal connections to drive T6963 LCD module
« Reply #5 on: August 08, 2020, 12:41:27 pm »
Yes, it's the STM32F030F4 in a TSSOP20 package; the XTAL is on the board so the PF1 and PF2 lines aren't available.
It's academic now, I found the code wouldn't compile to fit in the 16K of flash available even using the maximum amount of code size optimisation.
 

Offline Scrts

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Re: Minimal connections to drive T6963 LCD module
« Reply #6 on: August 08, 2020, 08:23:49 pm »
the XTAL is on the board so the PF1 and PF2 lines aren't available.

Well... You can always remove it  :-/O
 


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