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Field SETUP reader - Setup transaction completed Device mode This bit is read-only and it is set by the hardware when the last completed transaction is a SETUP. This bit changes its value only for control endpoints. It must be examined, in the case of a successful receive transaction (VTRX event), to determine the type of transaction occurred. To protect the interrupt service routine from the changes in SETUP bits due to next incoming tokens, this bit is kept frozen while VTRX bit is at 1; its state changes when VTRX is at 0. This bit is read-only. Host mode This bit is set by the software to send a SETUP transaction on a control endpoint. This bit changes its value only for control endpoints. It is cleared by hardware when the SETUP transaction is acknowledged and VTTX interrupt generated.