UPSD3422_V01 datasheet(172/300 Pages) STMICROELECTRONICS

172 / 300 page

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USB interface

UPSD3422, UPSD3433, UPSD3434, UPSD3454

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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 124) 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 124.

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]

Table 125.

USEL register bit definition

Bit

Symbol

R/W

Definition

7DIR

R/W

FIFO’s Direction Select Bit:

0: IN FIFO select

1: OUT FIFO select

–

Reserved

–

Reserved

–

Reserved

–

Reserved

2:0

R/W

Endpoint Selects Bits:

0: Endpoint0

1: Endpoint1

2: Endpoint2

3: Endpoint3

4: Endpoint4

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UPSD3422 Datasheet(PDF) 172 Page - STMicroelectronics

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