Datasheet

Section 14 Universal Serial Bus (USB)
Rev.7.00 Dec. 24, 2008 Page 506 of 698
REJ09B0074-0700
14.5.4 Control Transfer
The control transfer consists of three stages; setup, data (sometimes omitted), and status, as shown
in figure 14.11. The data stage consists of multiple bus transactions. Figures 14.12 to 14.16 show
operation flows in each stage.
Control-in
Setup stage Data stage Status stage
Control-out
No data
SETUP (0)
DATA0
SETUP (0)
DATA0
SETUP (0)
DATA0
IN (1)
DATA1
OUT (1)
DATA1
IN (0)
DATA0
OUT (0)
. . .
. . .
DATA0
IN (0/1)
DATA0/1
OUT (0/1)
DATA0/1
OUT (1)
DATA1
IN (1)
DATA1
IN (1)
DATA1
Figure 14.11 Control Transfer Stage Configuration