UPSD3422 datasheet(165/293 Pages) STMICROELECTRONICS

Part #	UPSD3422

Description	Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic

PDF	293 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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uPSD34xx

USB interface

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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 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

–

Reserved

–

Reserved

–

Reserved

–

Reserved

2:0

R/W

Endpoint Selects Bits:

0: Endpoint0

1: Endpoint1

2: Endpoint2

3: Endpoint3

4: Endpoint4

UPSD3422 Datasheet(PDF) 165 Page - STMicroelectronics

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