AT89C5132-ROTIL datasheet(74/181 Pages) ATMEL

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4173D–USB–02/06

AT89C5132

Reset Value = 0000 0000b

Table 58. USBINT Register

USBINT (S:BDh) – USB Global Interrupt Register

Reset Value = 0000 0000b

Table 59. USBIEN Register

USBIEN (S:BEh) – USB Global Interrupt Enable Register

Bit

Number

Bit

Mnemonic

Description

7FEN

Function Enable Bit

Set to enable the function. The device firmware shall 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 shall be written with the value set by a SET_ADDRESS request received by

the device firmware.

WUPCPU

EORINT

SOFINT

SPINT

Bit

Number

Bit

Mnemonic Description

7 - 6

Reserved

The values read from these Bits are 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 a 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 values read from these Bits are 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.

543

210

EWUPCPU

EEORINT

ESOFINT

ESPINT

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