r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 991
r4f2456
Manufacturer Part Number
r4f2456
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R4F2456.pdf
(1376 pages)
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(1)
Setup Stage
Notes: 1. In the setup stage, the application analyzes command data from the host requiring processing by
Receive 8-byte command
SETUP token reception
Set setup command
reception complete flag.
(IFR1.SETUP TS = 1)
2. When the transfer direction is control-out, the EP0i transfer request interrupt required in the status
to be processed by
the application, and determines the subsequent processing (for example, data stage direction, etc.).
stage should be enabled here. When the transfer direction is control-in, this interrupt is not required
and should be disabled.
To data stage
data in EP0s
application?
Command
Yes
USB function
Figure 16.11 Setup Stage Operation
No
processing by
Interrupt request
this module
Automatic
Clear SETUP TS flag.
(IFR1.SETUP TS = 0)
Clear EP0i FIFO. (FCLR0.EP0iCLR = 1)
Clear EP0o FIFO..(FCLR0.EP0oCLR = 1)
To control-in
Decode command data.
Determine data stage direction.*
Write 1 to EP0s read complete bit.
(TRG0.EP0s RDFN = 1)
data stage
Rev. 1.00 Sep. 19, 2008 Page 961 of 1342
Read 8-byte data from EP0s.
Section 16 USB Function Module (USB)
Application
*
2
To control-out
data stage
REJ09B0467-0100
1
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