TM4C1237D5PM_15 Datasheet, PDF (1098/1277 Pages) Texas Instruments – Tiva Microcontroller

Universal Serial Bus (USB) Controller
Register 3: USB Transmit Interrupt Status (USBTXIS), offset 0x002
Important: This register is read-sensitive. See the register description for details.
OTG A /
Host
OTG B /
Device
USBTXIS is a 16-bit read-only register that indicates which interrupts are currently active for endpoint
0 and the transmit endpoints 1–7. The meaning of the EPn bits in this register is based on the mode
of the device. The EP1 through EP7 bits always indicate that the USB controller is sending data;
however, in Host mode, the bits refer to OUT endpoints; while in Device mode, the bits refer to IN
endpoints. The EP0 bit is special in Host and Device modes and indicates that either a control IN
or control OUT endpoint has generated an interrupt.
Note: Bits relating to endpoints that have not been configured always return 0. Note also that all
active interrupts are cleared when this register is read.
USB Transmit Interrupt Status (USBTXIS)
Base 0x4005.0000
Offset 0x002
Type RO, reset 0x0000
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
EP7
EP6
EP5
EP4
EP3
EP2
EP1
EP0
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
15:8
7
Name
reserved
EP7
Type
RO
RO
Reset
0
0
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
TX Endpoint 7 Interrupt
Value Description
0 No interrupt.
1 The Endpoint 7 transmit interrupt is asserted.
6
EP6
RO
0
TX Endpoint 6 Interrupt
Same description as EP7.
5
EP5
RO
0
TX Endpoint 5 Interrupt
Same description as EP7.
4
EP4
RO
0
TX Endpoint 4 Interrupt
Same description as EP7.
3
EP3
RO
0
TX Endpoint 3 Interrupt
Same description as EP7.
2
EP2
RO
0
TX Endpoint 2 Interrupt
Same description as EP7.
1
EP1
RO
0
TX Endpoint 1 Interrupt
Same description as EP7.
1098
Texas Instruments-Production Data
June 12, 2014