SPI Interface on CFAG14432E-TFH-TT

[daryll]

I'm reading the datasheet, and it indicates that setting PSB=0 should put the ST7920 in SPI mode. The problem is that I don't see anything telling me how to do that.

What are the pins for SPI once the change is made?

Thanks

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[CF Tech]

That is probably in the controller data sheet:

http://www.crystalfontz.com/controllers/ST7920.pdf

Had you found that?

Page 7: Looks like R/W becomes MOSI and E becomes SCK. PSB is on that same page. It is a pin.

 

[daryll]

Brought out to the PCB?

OK, that document tells me it's pin23 on the controller, but the question is where you exposed it in your PCB. I don't have direct access to the pins on the controller.

 

[CF Support2]

To enable SPI mode on the CFAG14432E series, you need to move the zero Ohm jumper in JF1 from right to left (3 position jumper). Your resulting pin out will be:

VSS ==> VSS
VDD ==> VDD
VO ==> VO
RS ==> CS
R/W ==> SID
E ==> SLK
DB0~DB7 ==> No Connect

 

[daryll]

Thanks

That's exactly what I needed.

Thanks!