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F28E120SC: GPIO Numbers 17, 21, 22 and 46 do not have data or control registers

Ganesh Thambhahalli Satyen
Prodigy 195 points

Part Number: F28E120SC

Hi,

GPIO Numbers 17, 21, 22 and 46 do not have data or control registers. They are however listed in the GPIO Peripheral Muxing table and are present in the GPIOLPMSEL register of CPU_SYS_REGS. Are these GPIO pins not for regular usage and only for LPM wakeup?

  • 0
    TI__Expert 8660 points

    Hi Ganesh, sorroy for delay here! A person from our team will reach out soon!

  • +1 in reply to Masoud Farhadi
    TI__Mastermind 23151 points

    Hi Ganesh,

    The GPIOs you listed can be used as regular GPIOs, they are just not bonded out to any pins on the device. These are actually quite useful for performing device "workarounds" where you would typically use an external GPIO pin. For example, you can leverage the OUTPUTXBAR's OR mux capabilities to output to one of these internally-bonded GPIOs then bring the signal back into the device for use with something like an ADCEXTSOC or ECAP. This removes the need for using external logic device and makes up for this device not having a CLB logic block.

    Regards,

    Peter