NHD‐3.12‐25664UMB3 3 or 4 wire interface

cliffg

• February 13, 2015 08:16

When using the 3 or 4 wire SPI interface what is the difference between
Pins on 7-8 and the full set of pins on 19-22?
What are the pins on 7-8 needed for?

7 SCLK MPU Serial Clock signal.
8 SDIN MPU Serial Data Input signal.

19 MF_SCLK MPU Multi‐font IC Serial Clock Input
20 MF_SI MPU Multi‐font IC Serial Data Input
21 /MF_CS2 MPU Multi‐font IC Active LOW Chip Enable signal.
22 MF_SO MPU Multi‐font IC Serial Data Output

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  Michael_L

  • February 13, 2015 16:43

  The 4 pins (pins 19-22) are the serial lines for the multi-font IC on that display's PCB.  It is merely a chip with many different fonts/languages stored on it, and is separate from the display's controller.
  That being said, the pins 7 and 8 are the serial lines for the actual display.  For the 4-wire mode, pins 4 and 16 are used with them, and for the 3-wire mode only pin 16 is.  For a clearer understanding of this, please refer to the table in the datasheet on page 5 titled "MPU Interface Pin Assignment Summary".

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