H8SSLASH2218 datasheet(555/750 Pages) RENESAS

555 / 750 page

Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 507 of 698

REJ09B0074-0600

(1) Setup Stage

USB function

Firmware

Receive SETUP token

Receive 8-byte command

data in UEDR0s

To data stage

Set setup command

recive complete flag

(SetupTS in UIFR0 = 1)

Automatic

processing by

this module

Clear SetupTS flag

(SetupTS in UIFR0 = 0)

Clear EP0i FIFO (EP0iCLR in UFCLR = 1)

Clear EP0o FIFO (EP0oCLR in UFCLR = 1)

Read 8-byte data from UEDR0s

Decode command data

Determine data stage direction*1

Write 1 to EP0s read complete bit

(EP0sRDFN in UTRG0 = 1)

To control-in

data stage

To control-out

data stage

Command

to be processed by

firmware?

EXIRQx

Yes

Notes: 1. In the setup stage, the firmware first analyzes the command data that is sent from the host and

required to be processed by the firmware, and determines subsequent processing.

(For example, the data stage direction.)

2. When the transfer direction is control-out, the EP0i transfer request interrupt that is required in the

status stage should be enabled. When the transfer direction is control-in, this interrupt is not

required and must be disabled.

Figure 14.12 Setup Stage Operation

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