4 endpoint context registers, Endpoint context registers -27, Endpoint – Freescale Semiconductor MCF5480 User Manual
Page 901
Memory Map/Register Definition
MCF548x Reference Manual, Rev. 3
Freescale Semiconductor
29-27
29.2.4
Endpoint Context Registers
The endpoint registers are used to configure each of the individual endpoints. Some of the registers come
in pairs: an IN register and an OUT register. The current direction of the endpoint determines which of the
two registers controls the attributes for the specified endpoint. For example, if endpoint one is being used
as an IN endpoint, then only the IN registers are valid.
NOTE
Endpoint 0 is always present and bi-directional. The OUT version of all EP0
registers is the valid register.
29.2.4.1
Endpoint n Attribute Control Register (EP0ACR, EPnOUTACR,
EPnINACR)
The endpoint attribute control register specifies the USB transfer type for this endpoint. This register is
read-only for endpoint 0 and read/write for all other endpoints.
These registers should be updated by the USB application before enabling the USB device for the first time
and again following a configuration change (that is, upon the reception of a SET_CONFIGURATION or
SET_INTERFACE request).
3
BSECNT
Bitstuffing error counter overflow flag.
0 The bitstuffing error counter has not overflowed.
1 The bitstuffing error counter has overflowed.
2
CRCECNT CRC error counter overflow flag.
0 The CRC error counter has not overflowed.
1 The CRC error counter has overflowed.
1
DPCNT
Dropped packet counter overflow flag.
0 The dropped packet counter has not overflowed.
1 The dropped packet counter has overflowed.
0
PPCNT
Packet passed counter overflow flag.
0 The packet passed counter has not overflowed.
1 The packet passed counter has overflowed.
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
TTYPE
W
Reset
0
0
0
0
0
0
Uninitialized
Reg
Addr
MBAR + 0xB101(EP0ACR); 0xB131(EP1OUTACR); 0xB161(EP2OUTACR);
0xB191(EP3OUTACR); 0xB1C1(EP4OUTACR); 0xB1F1(EP5OUTACR);
0xB221(EP6OUTACR)
Figure 29-26. Endpoint n Attribute Control Register OUT (EPnOUTACR)
Table 29-25. CNTOVR Field Descriptions (Continued)
Bits
Name
Description