HC705JB2GRSSLASHH datasheet(100/128 Pages) NXP

100 / 128 page

GENERAL RELEASE SPECIFICATION

August 28, 1998

UNIVERSAL SERIAL BUS MODULE

MC68HC705JB2

10-32

REV 1.1

Figure 10-32. IN Token Data Flow for Transmit Endpoint 1/ Endpoint 2

Transmit Endpoint Enabled?

(USBEN = 1)

Transmit Endpoint ready to Transfer?

(TX1E = 1) && (TXD1F = 0) &

No Response

from USB function

Send NAK

Handshake

Set TXD1F to 1

Transmit Endpoint

Interrupt Enabled?

(TXD1IE = 1)

No Interrupt

Valid transaction

Interrupt generated

Transmit Endpoint not Stalled by firmware?

(STALL1 & ENDP1) + (STALL2 & ENDP2)

Send STALL

Handshake

Send DATA

Data PID set by T1SEQ

Valid IN token

received for Endpoints 1 or 2

ACK received and no

Time-out condition occurs?

No Response

from USB function

((ENDP2 & ENDADD) + (ENDP1 & ENDADD))

ENDP1 is Endpoint 1 directed traffic

ENDP2 is Endpoint 2 directed traffic

Note:

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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