Ok, I found some Renesas Technical Update documents tangentially related to this issue: “Disclosing the Specifications of Status Flags of the Serial Communications Interface (SCI) and Serial Peripheral Interface (RSPI) in RX Family Products” documentation.renesas.com/.../tnrxa138aeorg.pdf and: “Note on Setting the SCR Register of the Serial Communications Interface (SCI)” documentation.renesas.com/.../tnrxa130be.pdf The first document describes the previously reserved bits “SSR.b6 and SSR.b7 as SSR.RDRF and SSR.TDRE respectively. Not too much help with this issue, but will give further insight. The second document clarifies how to initialise the SCI for transmission. If caution is not taken the transmit end interrupt may occur before the transmit data empty interrupt. I will see if following the cautions described in the second document help the receive issue.
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