SPRUII7B User guide

SPRUII7B June 2018 – April 2020 TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

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2.3.6 GPIO18/X2

The F280049C oscillator clock output signal, X2, is multiplexed with GPIO18. By default, the Launchpad uses an on-board crystal oscillator, Y2, as the clock source for the on-chip Phase-Locked Loop (PLL) that requires both X1 and X2 signals of the MCU. To balance the requirement of having cleanly routed oscillator signals and bringing all possible GPIOs to the BoosterPack connectors, GPIO18/X2 can be routed to the BoosterPack connectors through a 0 Ω resistor. If GPIO18 is needed at the BoosterPack connector, the on-chip zero-pin oscillators must be used as the clock source for the on-chip PLL. For more information on the X1/X2 configurations, see the device-specific data sheet.

If GPIO18 functionality is needed at the BoosterPack Connector:

Remove R31 to separate GPIO18 from Y2.
Populate R28 to connect GPIO18 to the BoosterPack connector.
Populate R35 to connect X1 to Ground.