H8SXSLASH1663 datasheet(849/1158 Pages) RENESAS

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Section 16 USB Function Module (USB)

Rev.1.00 Jun. 07, 2006 Page 797 of 1102

REJ09B0294-0100

(2) Data Stage (Control-In)

USB function

Application

IN token reception

Data transmission to host

Set EP0i transmission

complete flag

(IFR0.EP0i TS = 1)

From setup stage

Write data to EP0i

data register (EPDR0i)

Write 1 to EP0i packet

enable bit

(TRG.EP0i PKTE = 1)

Clear EP0i transmission

complete flag

(IFR0.EP0i TS = 0)

Write 1 to EP0i packet

enable bit

(TRG.EP0i PKTE = 1)

Write data to EP0i

data register (EPDR0i)

1 written

to TRG.EP0s

RDFN?

Valid data

in EP0i FIFO?

NACK

Yes

ACK

Interrupt

request

Figure 16.11 Data Stage (Control-In) 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 in-

transfer, one packet of data to be sent to the host is written to the FIFO. If there is more data to be

sent, this data is written to the FIFO after the data written first has been sent to the host (EP0iTS

bit in IFR0 = 1).

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

is entered.

Note:

If the size of the data transmitted by the function is smaller than the data size requested by

the host, the function indicates the end of the data stage by returning to the host a packet

shorter than the maximum packet size. If the size of the data transmitted by the function is

an integral multiple of the maximum packet size, the function indicates the end of the data

stage by transmitting a zero-length packet.

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