AT83SND1CXXX-ROTIL datasheet(105/212 Pages) ATMEL

105 / 212 page

105

4109J–8051–10/06

AT8xC51SND1C

Reset Value = 0000 0000b

Table 90. UEPDATX Register

UEPDATX (S:CFh) – USB Endpoint X FIFO Data Register (X = EPNUM set in UEPNUM)

Reset Value = XXh

Table 91. UBYCTX Register

UBYCTX (S:E2h) – USB Endpoint X Byte Count Register (X = EPNUM set in UEPNUM)

Bit

Number

Bit

Mnemonic

Description

7 - 3

Reserved

The value read from these bits is always 0. Do not set these bits.

2EP2INT

Endpoint 2 Interrupt Flag

This bit is set by hardware when an endpoint interrupt source has been detected

on the endpoint 2. The endpoint interrupt sources are in the UEPSTAX register

and can be: TXCMP, RXOUTB0, RXOUTB1, RXSETUP or STLCRC.

A USB interrupt is triggered when the EP2IE bit in the UEPIEN register is set.

This bit is cleared by hardware when all the endpoint interrupt sources are

cleared.

1EP1INT

Endpoint 1 Interrupt Flag

This bit is set by hardware when an endpoint interrupt source has been detected

on the endpoint 1. The endpoint interrupt sources are in the UEPSTAX register

and can be: TXCMP, RXOUTB0, RXOUTB1, RXSETUP or STLCRC.

A USB interrupt is triggered when the EP1IE bit in the UEPIEN register is set.

This bit is cleared by hardware when all the endpoint interrupt sources are

cleared.

0EP0INT

Endpoint 0 Interrupt Flag

This bit is set by hardware when an endpoint interrupt source has been detected

on the endpoint 0. The endpoint interrupt sources are in the UEPSTAX register

and can be: TXCMP, RXOUTB0, RXOUTB1, RXSETUP or STLCRC.

A USB interrupt is triggered when the EP0IE bit in the UEPIEN register is set.

This bit is cleared by hardware when all the endpoint interrupt sources are

cleared.

7654

3210

FDAT7

FDAT6

FDAT5

FDAT4

FDAT3

FDAT2

FDAT1

FDAT0

Bit

Number

Bit

Mnemonic

Description

7 - 0

FDAT7:0

Endpoint X FIFO Data

Data Byte to be written to FIFO or data Byte to be read from the FIFO, for the

Endpoint X (see EPNUM).

7654

3210

BYCT6

BYCT5

BYCT4

BYCT3

BYCT2

BYCT1

BYCT0

AT83SND1CXXX-ROTIL Scheda tecnica(PDF) 105 Page - ATMEL Corporation

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