27.5.7 USBIS Register (Offset = 0xA) [reset = 0x0]
USB General Interrupt Status (USBIS)
OTG A / Host
OTG B / Device
USBIS is an 8-bit read-only register that indicates which USB interrupts are currently active. All active interrupts are cleared when this register is read.
USBIS for OTG A / Host is shown in Figure 27-9 and described in Table 27-14.
USBIS for OTG B / Device is shown in Figure 27-10 and described in Table 27-15.
Return to Summary Table.
Figure 27-9 USBIS Register (OTG A / Host)
| 7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
| VBUSERR |
SESREQ |
DISCON |
CONN |
SOF |
BABBLE |
RESUME |
RESERVED |
| R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
|
Table 27-14 USBIS Register Field Descriptions (OTG A / Host)
| Bit |
Field |
Type |
Reset |
Description |
| 7 |
VBUSERR |
R |
0x0 |
VBUS Error.
0x0 = No interrupt.
0x1 = VBUS has dropped below the VBUS Valid threshold during a session.
|
| 6 |
SESREQ |
R |
0x0 |
SESSION REQUEST.
0x0 = No interrupt.
0x1 = SESSION REQUEST signaling has been detected.
|
| 5 |
DISCON |
R |
0x0 |
Session Disconnect.
0x0 = No interrupt.
0x1 = A Device disconnect has been detected.
|
| 4 |
CONN |
R |
0x0 |
Session Connect.
0x0 = No interrupt.
0x1 = A Device connection has been detected.
|
| 3 |
SOF |
R |
0x0 |
Start of Frame.
0x0 = No interrupt.
0x1 = A new frame has started.
|
| 2 |
BABBLE |
R |
0x0 |
Babble Detected.
0x0 = No interrupt.
0x1 = Babble has been detected. This interrupt is active only after the first SOF has been sent.
|
| 1 |
RESUME |
R |
0x0 |
RESUME Signaling Detected.
This interrupt can only be used if the USB controller's system clock is enabled.
If the user disables the clock programming, the USBDRRIS, USBDRIM, and USBDRISC registers should be used.
0x0 = No interrupt.
0x1 = RESUME signaling has been detected on the bus while the USB controller is in SUSPEND mode.
|
| 0 |
RESERVED |
R |
0x0 |
|
Figure 27-10 USBIS Register (OTG B / Device)
| 7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
| RESERVED |
DISCON |
RESERVED |
SOF |
RESET |
RESUME |
SUSPEND |
| R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
R-0x0 |
|
Table 27-15 USBIS Register Field Descriptions (OTG B / Device)
| Bit |
Field |
Type |
Reset |
Description |
| 7-6 |
RESERVED |
R |
0x0 |
|
| 5 |
DISCON |
R |
0x0 |
Session Disconnect.
0x0 = No interrupt.
0x1 = The device has been disconnected from the host.
|
| 4 |
RESERVED |
R |
0x0 |
|
| 3 |
SOF |
R |
0x0 |
Start of Frame.
0x0 = No interrupt.
0x1 = A new frame has started.
|
| 2 |
RESET |
R |
0x0 |
RESET Signaling Detected.
0x0 = No interrupt.
0x1 = RESET signaling has been detected on the bus.
|
| 1 |
RESUME |
R |
0x0 |
RESUME Signaling Detected.
This interrupt can only be used if the USB controller's system clock is enabled.
If the user disables the clock programming, the USBDRRIS, USBDRIM, and USBDRISC registers should be used.
0x0 = No interrupt.
0x1 = RESUME signaling has been detected on the bus while the USB controller is in SUSPEND mode.
|
| 0 |
SUSPEND |
R |
0x0 |
SUSPEND Signaling Detected.
0x0 = No interrupt.
0x1 = SUSPEND signaling has been detected on the bus.
|