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AT43USB326 Datasheet(PDF) 29 Page - ATMEL Corporation |
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AT43USB326 Datasheet(HTML) 29 Page - ATMEL Corporation |
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29 / 102 page  29 AT43USB326 3313D–USB–04/06 USB Endpoint Interrupt Sources An assertion or activation of one or more bits in the endpoint's Control and Status Register triggers the endpoint interrupts. These triggers are different for control and non-control end- points as described in the table below. Please refer to the Control and Status Register for more information. USB Interrupt Status Register – UISR • Bit 7 – SOF INT: Start of Frame Interrupt This bit is asserted after the USB hardware receives a valid SOF packet. • Bit 6 – EOF2 INT: EOF2 Interrupt This bit is asserted 10 clocks before the expected start of a frame. • Bit 5, 4 – Res: Reserved Bits These bits are reserved and always read as zero. • Bit 3 – HEP0 INT: Hub Endpoint 0 Interrupt • Bit 2 – FEP2 INT: Function Endpoint 2 Interrupt • Bit 1 – FEP1 INT: Function Endpoint 1 Interrupt • Bit 0 – FEP0 INT: Function Endpoint 0 Interrupt The hub and function interrupt bits will be set by the hardware whenever the following bits in the corresponding endpoint's Control and Status Register are modified by the USB hardware: 1. RX OUT Packet is set (control and OUT endpoints) 2. TX Packet Ready is cleared AND TX Complete is set (control and IN endpoints) 3. RX SETUP is set (control endpoints only) 4. TX Complete is set Table 9. USB Endpoint Interrupt Sources Bit Endpoint type RX_OUT_PACKET CONTROL, OUT TX_COMPLETE CONTROL, IN STALL_SENT CONTROL, IN RX_SETUP CONTROL Bit 7 6 5 4 3 2 1 0 $1FF7 SOF INT EOF2 INT – – HEP0 INT FE2 INT FE1 INT FE0 INT UISR Read/Write R R R R R R R R Initial Value 0 0 0 0 0 0 0 0 |
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