AT89C5131-RDTIL datasheet(138/176 Pages) ATMEL

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138

AT89C5131

4136B–USB–09/03

Table 95. UEPCONX Register

UEPCONX (S:D4h)

USB Endpoint X Control Register

Note:

1. (X = EPNUM set in UEPNUM Register UEPNUM (S:C7h) USB Endpoint Number)

Reset Value = 80h when UEPNUM = 0

Reset Value = 00h otherwise

765

43210

EPEN

DTGL

EPDIR

EPTYPE1

EPTYPE0

Bit Number

Bit

Mnemonic

Description

EPEN

Endpoint Enable

Set this bit to enable the endpoint according to the device configuration.

Endpoint 0 will always be enabled after a hardware or USB bus reset and

participate in the device configuration.

Clear this bit to disable the endpoint according to the device configuration.

Reserved

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

Reserved

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

Reserved

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

3DTGL

Data Toggle (Read-only)

This bit is set by hardware when a valid DATA0 packet is received and

accepted.

This bit is cleared by hardware when a valid DATA1 packet is received and

accepted.

2EPDIR

Endpoint Direction

Set this bit to configure IN direction for Bulk, Interrupt and Isochronous

endpoints.

Clear this bit to configure OUT direction for Bulk, Interrupt and Isochronous

endpoints.

This bit has no effect for Control endpoints.

1-0

EPTYPE[1:0]

Endpoint Type

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

configured as control):

00Control endpoint

01Isochronous endpoint

10Bulk endpoint

11Interrupt endpoint

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