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OMAPL138 uPP Interface data lines internal pullup/pull down resistors

Kalyan Vagvala
Prodigy 130 points
Other Parts Discussed in Thread: OMAPL138

Hello,

i am working on OMAPL138 processor uPP interface. i have my own driver used to configure uPP interface channels for transmitting data on data lines. Even though one of the uPP channel data line is pulled down to ground external, i am able to see the data in external device buffer.

Want to know if OMAPL138 uPP data lines have internal pull-up/pull-down resistor?

i did go through the data sheet "SPRUH77c" document and could able to get these details in uPP chapter. can you please help me in getting this information?

Thanks,

Kalyan 

  • 0
    TI__Guru**** 161600 points
    Hi Kalyan,

    Yes, they have a configurable pull-up/down, see Table 3-27. Universal Parallel Port (uPP) Terminal Functions and the notes bellow it.
    Corresponding registers are located in the device Technical Reference Manual, see section 11.5 SYSCFG Registers.

    Best Regards,
    Yordan