UPSD3422_06 Datasheet, PDF (158/293 Pages) STMicroelectronics – Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic

USB interface
uPSD34xx
● 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.
Bit 7
–
USB IN FIFO NAK interrupt enable register (UIE3 0E7h, reset value 00h)
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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