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7643 Datasheet(PDF) 220 Page - Renesas Technology Corp

Part # 7643
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  424 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7643 Datasheet(HTML) 220 Page - Renesas Technology Corp

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Rev.2.00
Aug 28, 2006
page 99 of 202
7643 Group
REJ09B0133-0200
APPLICATION
2.6 USB
Fig. 2.6.4 Communication sequence of control transfer
Control transfer
q Control Read
q Control Write
q No control data
Setup stage
SETUP
DATA0
Handshake
Data stage
IN
DATA1/0
Handshake
Status stage
OUT
DATA1
Handshake
Setup stage
SETUP
DATA0
Handshake
Data stage
OUT
DATA1/0
Handshake
Status stage
IN
DATA1
Handshake
Setup stage
SETUP
DATA0
Handshake
Status stage
IN
DATA1
Handshake
: Device issue
: Host issue
(3)
Communication sequence
Each transfer type has a different transfer sequence, as described below.
Control transfer communication sequence
The control transfer is the common transfer type used at setup for all devices. Each transfer
process consists of three different stages. The control transfer starts with the setup stage. Based
on the contents of the Setup stage, the data stage (control Read transfer or control Write transfer)
is executed. When the transfer is complete, the status stage is executed, completing one full
process.
Endpoint 0 is always used for control transfer.
Figure 2.6.4 shows the communication sequence for a control transfer.



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