H8SXSLASH1663M datasheet(1047/1504 Pages) RENESAS

1047 / 1504 page

Section 20 USB Function Module (USB)

Rev. 2.00 Sep. 24, 2008 Page 1015 of 1468

REJ09B0412-0200

(3)

Data Stage (Control-Out)

USB function

Application

OUT token reception

Data reception from host

OUT token reception

Set EP0o reception

complete flag

(IFR0.EP0o TS = 1)

Clear EP0o reception

complete flag

(IFR0.EP0o TS = 0)

Read data from EP0o

receive data size register

(EPSZ0o)

Write 1 to EP0o read

complete bit

(TRG.EP0o RDFN = 1)

Read data from EP0o

data register (EPDR0o)

1 written

to TRG.EP0s

RDFN?

1 written

to TRG.EP0o

RDFN?

NACK

ACK

Yes

Interrupt request

Figure 20.14 Data Stage (Control-Out) Operation

The application first analyzes command data from the host in the setup stage, and determines the

subsequent data stage direction. If the result of command data analysis is that the data stage is out-

transfer, the application waits for data from the host, and after data is received (EP0oTS bit in

IFR0 = 1), reads data from the FIFO. Next, the application writes 1 to the EP0o read complete bit,

empties the receive FIFO, and waits for reception of the next data.

The end of the data stage is identified when the host transmits an IN token and the status stage is

entered.

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