M68HC08 datasheet(203/332 Pages) FREESCALE

Part #	M68HC08

Description	MC68HC908JB16 Technical Data

PDF	332 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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203 / 332 page

Universal Serial Bus Module (USB)

MC68HC908JB16 — Rev. 1.1

Technical Data

Freescale Semiconductor

Universal Serial Bus Module (USB)

203

SETUP transactions cannot be stalled by the USB function. A SETUP

received by a control endpoint will clear the ISTALL0 and OSTALL0 bits.

The conditions for receiving a SETUP interrupt are shown in

Figure 11-30.

Figure 11-30. SETUP Token Data Flow for Receive Endpoint 0

ERROR FREE DATA PACKET?

NO RESPONSE

FROM USB FUNCTION

SET RXD0F TO 1

(RXD0IE = 1)

NO INTERRUPT

ACCEPT DATA

SET/CLEAR R0SEQ BIT

VALID SETUP TOKEN

RECEIVED FOR ENDPOINT 0?

USB MODULE ENABLED?

(USBEN = 1)

ENDPOINT 0 RECEIVE READY TO RECEIVE?

(RX0E = 1) AND (RXD0F = 0)

RECEIVE CONTROL ENDPOINT

INTERRUPT ENABLED?

VALID TRANSACTION

INTERRUPT GENERATED

NO RESPONSE

FROM USB FUNCTION

NO RESPONSE FROM

USB FUNCTION

IGNORE TRANSACTION

SET SETUP BIT TO 1

M68HC08 Datasheet(PDF) 203 Page - Freescale Semiconductor, Inc