SN8F2250B Series
USB 2.0 Full-Speed 8-Bit Micro-Controller
9.5.8 USB ENDPOINT 1 ENABLE REGISTER
The communication with the USB host using endpoint 1, endpoint 1’s FIFO is implemented as 16 bytes of dedicated
RAM. The endponit1 is an interrupt endpoint.
097H
UE1R
Read/Write
After reset
Bit 7
UE1E
R/W
0
Bit 6
UE1M1
R/W
0
Bit 5
UE1M0
R/W
0
Bit 4
UE1C4
R/W
0
Bit 3
UE1C3
R/W
0
Bit 2
UE1C2
R/W
0
Bit 1
UE1C1
R/W
0
Bit 0
UE1C0
R/W
0
Bit [4:0] UE1C [4:0]: Indicate the number of data bytes in a transaction: For IN transactions, firmware loads the
count with the number of bytes to be transmitted to the host from the endpoint 1 FIFO.
Bit [6:5] UE1M [1:0]: The endpoint 1 modes determine how the SIE responds to USB traffic that the host sends to
the endpoint 1. For example, if the endpoint 1’s mode bit is set to 00 that is NAK IN/OUT mode as shown in
Table, The USB SIE will send NAK handshakes in response to any IN/OUT token set to the endpoint 1.The
bit 5 UE1M0 will auto reset to zero when the ACK transaction complete.
USB endpoint 1’s mode table
UE1M1
UE1M0
IN/OUT Token Handshake
0
0
1
1
0
1
0
1
NAK
ACK
STALL
STALL
Bit 7
UE1E: USB endpoint 1 function enable bit.
0 = disable USB endpoint 1 function.
1 = enable USB endpoint 1 function.
9.5.9 USB ENDPOINT 2 ENABLE REGISTER
The communication with the USB host using endpoint 2, endpoint 2’s FIFO is implemented as 16 bytes of dedicated
RAM. The endpoint 2 is an interrupt endpoint.
098H
UE2R
Read/Write
After reset
Bit 7
UE2E
R/W
0
Bit 6
UE2M1
R/W
0
Bit 5
UE2M0
R/W
0
Bit 4
UE2C4
R/W
0
Bit 3
UE2C3
R/W
0
Bit 2
UE2C2
R/W
0
Bit 1
UE2C1
R/W
0
Bit 0
UE2C0
R/W
0
Bit [4:0] UE2C [4:0]: Indicate the number of data bytes in a transaction: For IN transactions, firmware loads the
count with the number of bytes to be transmitted to the host from the endpoint 2 FIFO.
Bit [6:5] UE2M [1:0]: The endpoint 2 modes determine how the SIE responds to USB traffic that the host sends to
the endpoint 2. For example, if the endpoint 2’s mode bit is set to 00 that is NAK IN/OUT mode as shown in
Table, The USB SIE will send NAK handshakes in response to any IN/OUT token set to the endpoint 2. The
bit 5 UE2M0 will auto reset to zero when the ACK transaction complete.
USB endpoint 2’s mode table
UE2M1
UE2M0
IN/OUT Token Handshake
0
0
1
1
0
1
0
1
NAK
ACK
STALL
STALL
Bit 7
UE2E: USB endpoint 2 function enable bit.
0 = disable USB endpoint 2 function.
1 = enable USB endpoint 2 function.
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