UPSD3422EB40U6 datasheet(160/300 Pages) STMICROELECTRONICS

160 / 300 page

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UPSD3422, UPSD3433, UPSD3434, UPSD3454

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25.3.6

Accessing the setup command buffer

Setup Packets are sent from the host to a device’s Endpoint0 and consist of 8 bytes of

command data. When the SIE receives a Setup packet from the host, it stores the 8 bytes of

data in the Command Buffer. The command buffer is accessed via the indexed USB Setup

Command Value register (USCV). The USB Setup Command Index register (USCI) is used

to select the byte from the command buffer that is read when accessing the USCV register.

25.4

USB registers

The USB module is controlled via registers mapped into the SFR space. The USB SFRs

consist of the following:

●

UADDR: USB device address

●

UPAIR: USB FIFO pairing control

●

UIE0~3: USB interrupt enable

●

UIF0~3: USB interrupt flags

●

UCTL: USB control

●

USTA: USB status

●

USEL: USB endpoint and direction select

●

UCON: USB selected FIFO control register

●

USIZE: USB selected FIFO size register

●

UBASE: USB base address register

●

USCI: USB setup command index

●

USCV: USB setup command value

The memory map for the USB SFRs, the individual bit names, and the reset values are

shown in Table 99.

Table 99.

UPSD34xx USB SFR register map(1)

SFR

addr

(hex)

SFR

name

Bit name and <bit address>

Reset

value

(hex)

Comment

UADDR

–

USBADDR[6:0]

USB Address

UPAIR

–

PR3OU

PR1OUT

PR3IN

PR1IN

USB Pairing

Control

UIE0

–

RSTIE

SUSPNDIE

EOPIE

RESUMIE

USB Global

Interrupt

Enable

UIE1

–

IN4IE

IN3IE

IN2IE

IN1IE

IN0IE

USB IN FIFO

Interrupt

Enable

UIE2

–

OUT4IE

OUT3IE

OUT2IE

OUT1IE

OUT0IE

USB OUT

FIFO Interrupt

Enable

UIE3

–

NAK4IE

NAK3IE

NAK2IE

NAK1IE

NAK0IE

USB IN FIFO

NAK Int.

Enable

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UPSD3422EB40U6 Datasheet(PDF) 160 Page - STMicroelectronics

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