Author Topic: Connecting NHD-12232AZ-FL-YBW to a Cypress PSoC 3  (Read 2623 times)

rgayoso

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Connecting NHD-12232AZ-FL-YBW to a Cypress PSoC 3
« on: December 01, 2014, 05:29:29 PM »
I am connecting a NHD-12232AZ-FL-YBW display to a Cypress PSoC 3 cpu.
The cpu has separate RD' and WR'  active-low pulses.
Your datasheet says that the connector has only one R/W instead of separate read and write lines.
http://www.newhavendisplay.com/specs/NHD-12232AZ-FL-YBW.pdf
The  SBN1661G_M02 datasheet says that with the RESET pulse I can switch to a 80-type interface (instead of a 68-type interface). In the 80-type interface the R/W switches to WR' and the E switches to RD'.
My question is: You have two lines E1 and E2. I assume that this is because you have two SBN1661G_M02 chips.
If so, the E1 will switch to RD'1 and E2 will switch to RD'2.
But there is a single R/W line, that will switch to WR', so how do I know if I am writing to the 1st of 2nd chip?
Regards,
Ricardo

Michael_L

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Re: Connecting NHD-12232AZ-FL-YBW to a Cypress PSoC 3
« Reply #1 on: December 04, 2014, 03:06:55 PM »
You are correct, there are two chips used for this display.  Each Enable signal controls one, and the R/W signal is shared (tied together) between them.  Because of this, you would not be able to use the display in 8080 mode because you would then write (with the shared /WR signal) to both chips anytime your micro sends data to the display.

 

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