Renesas M16C Series User Manual page 140

M30245 Group
Communication Sequence
The control transfer is used common to all devices at the time of setup, which consists of three kinds
of stages being combined for one processing. The control transfer starts with setup stage. According
to the content, data stage (control read transfer or control write transfer) is executed, followed by
status stage being executed to finally complete one processing. In control transfer, use of endpoint 0
has been specified.
The communication sequence of control transfer is shown in Figure 2.8.4.
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Control trasnfer
Control Read
SETUP stage
Handshake
Control Write
SETUP stage
Handshake
No-data Control
SETUP stage
Handshake
Figure 2.8.4. Control transfer communication sequence
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
SETUP
DATA0
SETUP
DATA0
SETUP
DATA0
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DATA stage
IN
DATA1/0
Handshake
DATA stage
OUT
DATA1/0
Handshake
2. USB function
Status stage
OUT
DATA1
Handshake
Status stage
IN
DATA1
Handshake
Status stage
IN
DATA1
: Host issues
Handshake
: Device issues