MC68HC908LD64 Datasheet, PDF (198/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
14.6.3 USB SIE Timing Interrupt Register (SIETIR)
Address: $0056
Bit 7
6
5
4
3
2
1
Bit 0
Read: SOFF
Write:
EOF2F
EOPF
TRANF
SOFIE EOF2IE EOPIE TRANIE
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 14-5. USB SIE Timing Interrupt Register (SIETIR)
SOFF — Start Of Frame Detect Flag
This read-only bit is set when a valid SOF PID is detected on the D0+
and D0– lines at the root port. Software must clear this flag by writing
a logic 1 to SOFFR bit in the SIETSR register. Reset clears this bit.
Writing to SOFF has no effect.
1 = Start Of Frame PID has been detected
0 = Start Of Frame PID has not been detected
EOF2F — Second End Of Frame Point Flag
This read-only bit is set when the internal frame timer counts to the bit
time that the hub must see upstream traffic terminated near the end
of frame. This bit time is defined as 10 bit times from the next Start Of
Frame PID. Software must clear this flag by writing a logic 1 to
EOF2FR bit in the SIETSR register. Reset clears this bit. Writing to
EOF2F has no effect.
1 = Frame timer counts to the EOF2 point
0 = Frame timer does not count to the EOF2 point
EOPF — End of Packet Detect Flag
This read-only bit is set when a valid End Of Packet sequence is
detected on the D0+ and D0– lines. Software must clear this flag by
writing a logic 1 to the EOPFR bit in the SIETSR register. Reset clears
this bit. Writing to EOPF has no effect.
1 = End-of-Packet sequence has been detected
0 = End-of-Packet sequence has not been detected
Data Sheet
198
Universal Serial Bus Module (USB)
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor