TUSB5052 datasheet(38/82 Pages) TI

38 / 82 page

5−4

5.6

USBCTL: USB Control Register

Unlike the rest of the registers, this register is cleared by the power-up-reset signal only. The USB reset cannot reset

this register (see Figure 5−1).

CONT

U1/2

RWUP

FRSTE

RSV

B/S

SIR

DIR

R/W

R/O

R/W

R/O

R/W

BIT

NAME

RESET

FUNCTION

DIR

As a response to a setup packet, the MCU decodes the request and sets/clears this bit to reflect the data transfer

direction.

DIR = 0 USB data-OUT transaction (from host to TUSB5052).

DIR = 1 USB data-IN transaction (from TUSB5052 to host).

SIR

SETUP interrupt-status bit. This bit is controlled by the MCU to indicate to the hardware when the SETUP interrupt

is being served.

SIR = 0

SETUP interrupt is not served. The MCU clears this bit before exiting the SETUP interrupt routine.

SIR = 1

SETUP interrupt is in progress. The MCU sets this bit when servicing the SETUP interrupt.

BS = 0 Bus-powered hub

BS = 1 Self-powered hub

RSV

Reserved

FRSTE

Function reset-connection bit. This bit connects/disconnects the USB function reset to/from the MCU reset.

FRSTE =0 Function reset is not connected to MCU reset.

FRSTE =1 Function reset is connected to MCU reset.

RWUP

Device remote wake-up request. This bit is set by the MCU and is cleared automatically.

RWUP = 0

Writing a 0 to this bit has no effect.

RWUP = 1

When MCU writes a 1, a remote wake-up pulse is generated.

U1/2

USB hub version

U1/2 = 0 This is a USB1.x hub.

U1/2 = 1 This is a USB2.x hub.

CONT

Connect/disconnect bit

CONT = 0 Upstream port is disconnected. Pullup disabled

CONT = 1 Upstream port is connected. Pullup enabled

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