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UPSD3422 Datasheet(PDF) 158 Page - STMicroelectronics |
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UPSD3422 Datasheet(HTML) 158 Page - STMicroelectronics |
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158 / 293 page  USB interface uPSD34xx 158/293 ● USB IN FIFO NAK Interrupt Enable Register (UIE3) When an endpoint’s IN FIFO is empty and an IN transaction to that endpoint has been received, the SIE sends a NAK handshake token since there is no data ready for it to send. The UIE3 register (see Table 75) is used to enable each endpoint’s IN FIFO NAK Interrupt. Table 75. USB IN FIFO NAK interrupt enable register (UIE3 0E7h, reset value 00h) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 – – – NAK4IE NAK3IE NAK2IE NAK1IE NAK0IE Bit Symbol R/W Definition 7 – – Reserved 6 – – Reserved 5 – – Reserved 4 NAK4IE R/W Enable Endpoint 4 IN FIFO NAK interrupt 3 NAK3IE R/W Enable Endpoint 3 IN FIFO NAK interrupt 2 NAK2IE R/W Enable Endpoint 2 IN FIFO NAK interrupt 1 NAK1IE R/W Enable Endpoint 1 IN FIFO NAK interrupt 0 NAK0IE R/W Enable Endpoint 0 IN FIFO NAK interrupt |
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