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GPIO access to FEC3 pins using UCC3/UART

Question asked by Van Goethem Frédéric on Jan 12, 2018
Latest reply on Jan 17, 2018 by alexander.yakovlev



I need some information's about IO configuration on MPC8309. On page 184/1048 of the datasheet (MPC8309RM), I can see the configuration details of SICR_2 register. Table 6-28 seems to indicate that IO's linked to FEC3 are no more configurable as GPIO if I use FEC3.


In my project, I use UCC3 as UART (Table 6-29, p185). This UART uses FEC3_RXD0, FEC3_TXD0, FEC3_TX_EN so I suppose that bits [0-1] of SICR_2 shall be configured as [0-0]. Does it mean that the other IO's associated to FEC3 are no more configurable as GPIO? In other words, is it possible to use UCC3 as UART and configure other pin's of FEC3 as GPIO?


This point is really critical in my project because I also use UCC1 and UCC2, also for UART's, and need many GPIO's.


Thanks for support.