AT89C5131A-RDTUM datasheet(142/188 Pages) ATMEL

142 / 188 page

142

4337K–USB–04/08

AT89C5130A/31A-M

Table 21-6.

USBADDR Register

USBADDR (S:C6h)

USB Address Register

Reset Value = 80h

Table 21-7.

UEPNUM Register

UEPNUM (S:C7h)

USB Endpoint Number

Reset Value = 00h

FEN

UADD6

UADD5

UADD4

UADD3

UADD2

UADD1

UADD0

Bit Number

Bit

Mnemonic

Description

FEN

Function Enable

Set this bit to enable the address filtering function.

Cleared this bit to disable the function.

6-0

UADD[6:0]

USB Address

This field contains the default address (0) after power-up or USB bus reset.

It will be written with the value set by a SET_ADDRESS request received by the device

firmware.

EPNUM3

EPNUM2

EPNUM1

EPNUM0

Bit Number

Bit Mnemonic

Description

7-4

Reserved

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

3-0

EPNUM[3:0]

Endpoint Number

Set this field with the number of the endpoint which will be accessed when reading

or writing to, UEPDATX Register UEPDATX (S:CFh) USB FIFO Data Endpoint X (X

= EPNUM set in UEPNUM Register UEPNUM (S:C7h) USB Endpoint Number),

UBYCTLX Register UBYCTLX (S:E2h) USB Byte Count Low Register X (X =

EPNUM set in UEPNUM Register UEPNUM (S:C7h) USB Endpoint Number),

UBYCTHX Register UBYCTHX (S:E3h) USB Byte Count High Register X (X =

EPNUM set in UEPNUM Register UEPNUM (S:C7h) USB Endpoint Number) or

UEPCONX Register UEPCONX (S:D4h) USB Endpoint X Control Register. This

value can be 0, 1, 2, 3, 4, 5 or 6.

AT89C5131A-RDTUM Datasheet(PDF) 142 Page - ATMEL Corporation

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