H8SSLASH2218 datasheet(560/750 Pages) RENESAS

Il numero della parte	H8S/2218

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

Scroll/Zoom	100%

Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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Section 14 Universal Serial Bus (USB)

Rev.6.00 Jun. 03, 2008 Page 512 of 698

REJ09B0074-0600

14.5.5

Interrupt-In Transfer (Endpoint 3)

USB function

Firmware

Receive IN token

Transmit data to host

Set EP3 transmit

complete flag

(EP3TS in UIFR0 = 1)

Write data to USB endpoint

data register 3 (UEDR3)

Write 1 to EP3 packet

enable bit

(EP3PKTE in UTRG0 = 1)

Clear EP3 transmit

complete flag

(EP3TS in UIFR0 = 0)

Write data to USB endpoint

data register3 (UEDR3)

Write 1 to EP3 packet

enable bit

(EP3PKTE in UTRG0 = 1)

Valid data

in EP3 FIFO?

Is there

transmit data

to host?

Is there

transmit data

to host?

Yes

NAK

ACK

Note:

This flowchart shows just one example of interrupt-in transfer processing. Other possibilities include an

operation flow in which, if there is data to be transmited, the EP3DE bit UDSR is referred to confirm that the

FIFO is empty, and then data is written to the FIFO.

EXIRQx

Figure 14.17 EP3 Interrupt-In Transfer Operation

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