AT89C5132-ROTIL datasheet(76/182 Pages) ATMEL

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4173E–USB–09/07

AT89C5132

Reset Value = 0000 0000b

Table 62. UEPSTAX Register

UEPSTAX (Soh) – USB Endpoint X Status and Control Register (X = EPNUM set in UEPNUM)

Bit

Number

Bit

Mnemonic Description

EPEN

Endpoint Enable Bit

Set to enable the endpoint according to the device configuration. Endpoint 0 shall

always be enabled after a hardware or USB bus reset and participate in the

device configuration.

Clear to disable the endpoint according to the device configuration.

6 - 4

Reserved

The values read from this bit is always 0. Do not set this bit.

DTGL

Data Toggle Status Bit (Read-only)

Set by hardware when a DATA1 packet is received.

Cleared by hardware when a DATA0 packet is received.

Note: When a new data packet is received without DTGL toggling from 1 to 0 or 0

to 1, a packet may have been lost. When this occurs for a Bulk endpoint, the

device firmware shall consider the host has retried transmitting a properly

received packet because the host has not received a valid ACK, then the

firmware shall discard the new packet (N.B. The endpoint resets to DATA0 only

upon configuration).

For interrupt endpoints, data toggling is managed as for Bulk endpoints when

used.

For Control endpoints, each SETUP transaction starts with a DATA0 and data

toggling is then used as for Bulk endpoints until the end of the Data stage (for a

control write transfer); the Status stage completes the data transfer with a DATA1

(for a control read transfer).

For Isochronous endpoints, the device firmware shall retrieve every new data

packet and may ignore this bit.

EPDIR

Endpoint Direction Bit

Set to configure IN direction for Bulk, Interrupt and Isochronous endpoints.

Clear to configure OUT direction for Bulk, Interrupt and Isochronous endpoints.

This bit has no effect for Control endpoints.

1 - 0

EPTYPE1:

Endpoint Type Bits

Set this field according to the endpoint configuration (Endpoint 0 shall always be

configured as Control):

Control endpoint

Isochronous endpoint

Bulk endpoint

Interrupt endpoint

DIR

STALLRQ

TXRDY

STLCRC

RXSETUP

RXOUT

TXCMP

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