AT83SND2CMP3B datasheet(123/241 Pages) ATMEL

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123

4341F–MP3–03/06

AT8xC51SND2C/MP3B

Table 16-4.

USBADDR Register

USBADDR (S:C6h) – USB Address Register

Reset Value = 0000 0000b

Table 16-5.

USBINT Register

USBINT (S:BDh) – USB Global Interrupt Register

Reset Value = 0000 0000b

543

210

FEN

UADD6

UADD5

UADD4

UADD3

UADD2

UADD1

UADD0

Bit Number

Bit

Mnemonic

Description

7FEN

Function Enable Bit

Set to enable the function. The device firmware should set this bit after it has received a

USB reset and participate in the following configuration process with the default address

(FEN is reset to 0).

Cleared by hardware at power-up, should not be cleared by the device firmware once

set.

6 - 0

UADD6:0

USB Address Bits

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

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

device firmware.

543

210

WUPCPU

EORINT

SOFINT

SPINT

Bit Number

Bit

Mnemonic

Description

7 - 6

Reserved

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

WUPCPU

Wake Up CPU Interrupt Flag

Set by hardware when the USB controller is in SUSPEND state and is re-activated by a

non-idle signal from USB line (not by an upstream resume). This triggers a USB interrupt

when EWUPCPU is set in the USBIEN.

Cleared by software after re-enabling all USB clocks.

4EORINT

End of Reset Interrupt Flag

Set by hardware when a End of Reset has been detected by the USB controller. This

triggers a USB interrupt when EEORINT is set in USBIEN.

Cleared by software.

3SOFINT

Start of Frame Interrupt Flag

Set by hardware when an USB Start of Frame packet (SOF) has been properly received.

This triggers a USB interrupt when ESOFINT is set in USBIEN.

Cleared by software.

2 - 1

Reserved

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

SPINT

Suspend Interrupt Flag

Set by hardware when a USB Suspend (Idle bus for three frame periods: a J state for 3

ms) is detected. This triggers a USB interrupt when ESPINT is set in USBIEN.

Cleared by software.

AT83SND2CMP3B Datasheet(PDF) 123 Page - ATMEL Corporation

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