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USB function
OUT token reception
Space
in EP2o FIFO?
Yes
Data reception from host
ACK
Set EP2o Data ready status
(UIFR1/EP2o READY = 1)
Both
EP2o FIFOs empty?
Yes
Clear EP2o Data ready status
(UIFR1/ EP2o READY = 0)
Figure 15.19 EP2o Bulk-In Transfer Operation
No
NACK
No
Firmware
Read USB endpoint receive
data size register 2o (UESZ2o)
Read data from USB endpoint
data register 2o (UEDR2o)
Write 1 to EP2o read
complete bit
(UTRG0/EP2o RDFN = 1)
Rev. 3.0, 10/02, page 503 of 686
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