Universal Serial Bus Controller User's Guide

4.51 Interrupt Register for Common USB Interrupts (INTRUSB)
www.ti.com Registers
The Interrupt Register for Common USB Interrupts (INTRUSB) is shown in Figure 66 and described in
Table 67 . Reading this register causes all bits to be cleared.
Note: Unless the UINT bit of CTRLR is set, do not read or write this register directly. Use the
INTSRCR register instead.
Figure 66. Interrupt Register for Common USB Interrupts (INTRUSB)
7 6 5 4 3 2 1 0
VBUSERR SESSREQ DISCON CONN SOF RESET_BABBLE RESUME SUSPEND
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
LEGEND: R = Read only; - n = value after reset
Table 67. Interrupt Register for Common USB Interrupts (INTRUSB) Field Descriptions
Bit Field Value Description
7 VBUSERR 0-1 Set when VBus drops below the VBus valid threshold during a session. Only valid when the USB
controller is 'A' device. All active interrupts will be cleared when this register is read.
6 SESSREQ 0-1 Set when session request signaling has been detected. Only valid when USB controller is 'A' device.
5 DISCON 0-1 Set in host mode when a device disconnect is detected. Set in peripheral mode when a session
ends.
4 CONN 0-1 Set when a device connection is detected. Only valid in host mode.
3 SOF 0-1 Set when a new frame starts.
2 RESET_BABBLE 0-1 Set in peripheral mode when reset signaling is detected on the bus set in host mode when babble is
detected.
1 RESUME 0-1 Set when resume signaling is detected on the bus while the USB controller is in suspend mode.
0 SUSPEND 0-1 Set when suspend signaling is detected on the bus only valid in peripheral mode.
SPRUGH3 – November 2008 Universal Serial Bus (USB) Controller 115
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