• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 247 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UB948-Q1: SPI communication with LCD controller

Arie Li
Expert 3390 points
Part Number: DS90UB948-Q1

Hi experts,

Considering the SPI communication between 948 and LCD controller, how to connect 948 MOSI and MISO pins under below condition?

1. The LCD controller has 3-wire SPI: SCLK, CS and a bidirectional single data line for both writing and reading. How should I conncet 948 MOSI and MISO pins to this single data line of LCD?

2. The LCD controller only support unidirectional communication and has 3-wire SPI: SCLK, CS and MOSI. How to connect 948 MISO pin? Can I just leave it not connected?

Thanks.

  • 0
    TI__Mastermind 18755 points

    Hello Arie,

    1. In this case it is acceptable to tie the MOSI and MISO pins to the same line only if the pins can be tri-stated when not in use.  See the HSCC_CONTROL register in the datasheet for more information.

    2. The datasheet states that when the pin is not in use that it should be connected to an external pull-down resistor.  See pin functions table SPI pins in the datasheet for more information.

    Regards,

    Nick