Freescale Semiconductor MCF5480 User Manual
Page 891
Memory Map/Register Definition
MCF548x Reference Manual, Rev. 3
Freescale Semiconductor
29-17
29.2.2.8
USB Application Interrupt Mask Register (USBAIMR)
The USBAIMR allows the application to mask interrupt sources within the USB module. The format of
this register is identical to that of the USBAISR. A logic 1 in any of the defined bit positions masks the
corresponding interrupt source. Conversely, a logic 0 allows the core to interrupt the application.
7
6
5
4
3
2
1
0
R
EPSTALL
CTROVFL
ACK
TRANSERR
EPHALT
OUT
IN
SETUP
W
Reset
0
0
0
0
0
0
0
0
Reg
Addr
MBAR + 0xB000
Figure 29-8. USB Application Interrupt Status Register (USBAISR)
Table 29-8. USBAISR Field Descriptions
Bits
Name
Description
7
EPSTALL
Endpoint stall. This bit is set when the PSTALL bit in either EPnOUTSR or EPnINSR is set and is
relevant only for control endpoints. When set, this bit indicates that a transfer protocol violation has
occurred on the current (control) endpoint.
0 Protocol STALL bit not set
1 Protocol STALL bit set in either EPnOUTSR or EPnINSR
6
CTROVFL
Counter overflow. Indicates that one or more of the statistics counters has rolled over. The CNTOVR
register identifies with counter has caused this condition.
0 None of the statistics counters have rolled over.
1 One or more of the statistics counters has rolled over.
5
ACK
Received acknowledge. Indicates the reception of a normal ACK packet in response to the data
phase of an IN transaction.
0 Did not receive ACK.
1 Received ACK.
4
TRANSER
R
Transaction error. Indicates the occurrence of a protocol error in the transaction. Examples include
a data or handshake packet timeout and reception of the data or handshake after the packet times
out.
0 Transaction error did not occur.
1 Transaction error occurred.
3
EPHALT
Endpoint halt. This bit is set when an active endpoint’s HALT is changed.
0 EPnOUTSR[HALT] or EPnINSR[HALT] has not changed.
1 EPnOUTSR[HALT] or EPnINSR[HALT] changed.
2
OUT
Received OUT. Indicates the reception of an OUT token packet.
0 Did not receive an OUT token packet.
1 Received an OUT token packet.
1
IN
Received IN. Indicates the reception of an IN token packet.
0 Did not receive an IN token packet.
1 Received an IN token packet.
0
SETUP
Received SETUP. Indicates the reception of a SETUP token packet.
0 Did not receive a SETUP token packet.
1 Received a SETUP token packet.