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Field THR512 reader - 512 byte threshold interrupt This bit is set to 1 by the hardware when 512 bytes have been transmitted or received during isochronous transfers. This bit is read/write but only 0 can be written and writing 1 has no effect. Note that no information is available to indicate the associated channel/endpoint, however in practice only one ISO endpoint/channel with such large packets can be supported, so that channel.