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Interconnectivity
Page 10 of 22
Firmware Programming Guide for PDIUSBD12
5.2 Control Endpoint Handler
No-data Control
return Status
Control Read
Control Write
INs
TRANSMIT
IDLE
RECEIVE
OUTs
Status
Status
Control transfer always begins with the SETUP stage and then followed later by an optional DATA stage. It
then ends with the STATUS stage. The diagram below shows the various states of transitions on the Control
endpoints. The firmware uses these 3 states to handle Control transfer correctly.
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