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Field ERR_TX reader - Transmit error Host mode This bit is set by the hardware when an error (e.g. no answer by the device, CRC error, bit stuffing error, framing format violation, etc.) has occurred during an OUT or SETUP transaction on this channel. The software can only clear this bit. If the ERRM bit in USB_CNTR register is set a generic interrupt condition is generated together with the channel related flag, which is always activated.