TUSB3410 datasheet(33/92 Pages) TI

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5–1

5 USB

5.1

USB Registers

5.1.1

FUNADR: Function Address Register (Addr:FFFF)

This register contains the device function address.

765

RSV

FA6

FA5

FA4

FA3

FA2

FA1

FA0

R/O

R/W

BIT

NAME

RESET

FUNCTION

6–0

FA[6:0]

These bits define the current device address assigned to the function. The MCU writes a value to this

RSV

Reserved = 0

5.1.2

USBSTA: USB Status Register (Addr:FFFE)

All bits in this register are set by the hardware and are cleared by the MCU when writing a 1 to the proper bit location

(writing a 0 has no effect). In addition, each bit can generate an interrupt if its corresponding mask bit is set (R/C

notation indicates read and clear only by the MCU).

765

RSTR

SUSR

RESR

RSV

URRI

SETUP

WAKEUP

STPOW

R/C

R/O

R/C

BIT

NAME

RESET

FUNCTION

STPOW

SETUP Overwrite bit. Set by hardware when setup packet is received while there is already a packet in

the setup buffer.

STPOW = 0

STPOW = 1

MCU can clear this bit by writing a 1 (writing 0 has no effect).

SETUP overwrite

WAKEUP

Remote wakeup bit

WAKEUP = 0

WAKEUP = 1

The MCU can clear this bit by writing a 1 (writing 0 has no effect).

Remote wakeup request from WAKEUP pin

SETUP

SETUP transaction received bit. As long as SETUP is 1, IN and OUT on endpoint–0 are NAKed,

regardless of their real NAK bits value.

SETUP = 0

SETUP = 1

MCU can clear this bit by writing a 1 (writing 0 has no effect).

SETUP transaction received

URRI

UART RI status bit – a rising edge causes this bit to be set.

URRI = 0

URRI = 1

URRI = 0 The MCU can clear this bit by writing a 1 (writing 0 has no effect).

URRI = 1 Ring detected, which is used to wake the chip up (bring it out of suspend).

RSV

Reserved

RESR

Function resume request bit

RESR = 0

RESR = 1

The MCU can clear this bit by writing a 1 (writing 0 has no effect).

Function resume is detected

SUSR

Function suspended request bit. This bit is set in response to a global or selective suspend condition.

FSUSP = 0

FSUSP = 1

The MCU can clear this bit by writing a 1 (writing 0 has no effect).

Function suspend is detected

RSTR

Function reset request bit. This bit is set in response to host initiating a port reset. This bit is not

affected by the USB function reset.

FRST = 0

FRST = 1

The MCU can clear this bit by writing a 1 (writing 0 has no effect).

Function reset is detected

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