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UPSD3422EB40U6 Fiches technique(PDF) 165 Page - STMicroelectronics |
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UPSD3422EB40U6 Fiches technique(HTML) 165 Page - STMicroelectronics |
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165 / 293 page  uPSD34xx USB interface 165/293 ● USB Endpoint Select Register (USEL) Endpoints share the same XDATA space for FIFOs as well as the same SFR addresses for Control and FIFO Valid Size registers. The USB Endpoint Select Register (see Table 82) is used to select the desired direction and endpoint that is accessed when reading or writing to the FIFO XDATA address space. This register is also used to select the direction and Endpoint when accessing the USB Endpoint Control Register. Table 82. USB endpoint select register (USEL 0EFh, reset value 00h) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 DIR – – – – EP[2] EP[1] EP[0] Bit Symbol R/W Definition 7DIR R/W FIFO’s Direction Select Bit: 0: IN FIFO select 1: OUT FIFO select 6 – – Reserved 5 – – Reserved 4 – – Reserved 3 – – Reserved 2:0 EP R/W Endpoint Selects Bits: 0: Endpoint0 1: Endpoint1 2: Endpoint2 3: Endpoint3 4: Endpoint4 |
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