12

TH6503 USB Low-Speed Interface

EP0/1/2 FIFO (write only)

Internal Address: b000, b001 or b010

Size:

8 bytes

The device user data is stored temporarily at this location for transfer to the USB host.

•

the address b000 indicates a data transfer from EP0

•

the address b001 indicates a data transfer from EP1

•

the address b010 indicates a data transfer from EP2

•

only one of the three addresses may be used at any one time; FIFO is used alternately, de-

pending on the device function

•

will be flushed with a new SETUP token for as long as bit SET in CntOutRegister is set

SerialFlagRegister (write only)

Internal address: b100

Size:

8 bits

All endpoints must remain deactivated until USB reset has been decoded (Statusregister <6>).

Register

Description

(continued)

Bit

Number

Bit

Mnemonic

Reset

Status

Function

7-6

X

0

reserved - must be set to 0

5

EO2

0

Enable EP2 OUT

?

?

activate endpoint 2 OUT

Microcontroller can set the bit after detecting a USB reset in order to

enable data transfers from the USB host via EP2

If set the CntOut Register bit <7-6> indicates the source of the last OUT

transfer binary coded

4

EO1

0

Enable EP1 OUT

?

?

activate endpoint 1 OUT

Microcontroller can set the bit after detecting a USB reset in order to

enable data transfers from the USB host via EP1

If set the CntOut Register bit <7-6> indicates the source of the last OUT

transfer binary coded

3

EI2

0

Enable EP2 IN

?

activate endpoint 2 IN

Microcontroller can set the bit after detecting a USB reset in order to

enable data transfers to the USB host via EP2

2

EI1

0

Enable EP1 IN

?

activate endpoint 1 IN

Microcontroller can set the bit after detecting a USB reset in order to

enable data transfers to the USB host via EP1

1

EI0

0

Enable EP0 IN

?

activate endpoint 0 (IN transfer)

is set automatically after detecting a USB reset to enable IN control

transfers to the USB host

0

EO0

0

Enable EP0 OUT

?

activate endpoint 0 (OUT transfer)

is set automatically after detecting a USB reset to enable OUT control

transfers to the USB host