H8SSLASH2218 datasheet(557/750 Pages) RENESAS

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Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 509 of 698

REJ09B0074-0600

(3) Data Stage (Control-Out)

The firmware first analyzes the command data that is sent 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, data from the host is waited for, and after data is received

(EP0oTS in UIFR0 is set to 1), data is read from the FIFO. Next, the firmware 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.

USB function

Firmware

Receive OUT token

Receive data from host

Receive OUT token

Set EP0o receive

complete flag

(EP0oTS in UIFR0 = 1)

Clear EP0o receive

complete flag

(EP0oTS in UIFR0 = 0)

Read data from USB endpoint

receive data size register 0o

(UESZ0o)

Write 1 to EP0o read

complete bit

(EP0oRDFN in UTRG0 = 1)

Read data from USB endpoint

data register 0o (UEDR0o)

1 written

to EP0sRDFN

in UTRG0?

1 written

to EP0oRDFN

in UTRG0?

NAK

ACK

Yes

EXIRQx

Figure 14.14 Data Stage Operation (Control-Out)

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