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CONTROLLING S5N8947 MODULES S5N8947 USB BULKOUT TRANSFER (ENDPOINT 1, 3) USB BulkOut endpoint is endpoint that can receive. (endpoint1,3) (1) Check endpoint1, 3 Interrupt. (2) Store received data length in endpoint1, 3. (3) Call endpoint BulkIn Function. USB BulkOut Function When Endpoint 3 Interrupt occurs, Call endpointBulkOutFunction. Read E3RDS_REGISTER Call EndpointBulkInFunction USB BulkOut Function End Figure 5-24. Concept Diagram for USB BulkOut Function 5-60