M68HC08 datasheet(202/332 Pages) FREESCALE

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Universal Serial Bus Module (USB)

Technical Data

MC68HC908JB16 — Rev. 1.1

202

Universal Serial Bus Module (USB)

Freescale Semiconductor

11.9.1.1 Receive Control Endpoint 0

For a control OUT transaction directed at endpoint 0, the USB module

will generate an interrupt by setting the RXD0F flag in the UIR0 register.

The conditions necessary for the interrupt to occur are shown in the

flowchart in Figure 11-29.

Figure 11-29. OUT Token Data Flow for Receive Endpoint 0

VALID OUT TOKEN

RECEIVED FOR ENDPOINT 0

ERROR FREE DATA PACKET?

NO RESPONSE

FROM USB FUNCTION

SET RXD0F TO 1

(RXD0IE = 1)

NO INTERRUPT

ACCEPT DATA

NO RESPONSE

FROM USB FUNCTION

TIMEOUT

SET/CLEAR R0SEQ BIT

VALID DATA TOKEN

RECEIVED FOR ENDPOINT 0?

USB MODULE ENABLED?

(USBEN = 1)

ENDPOINT 0 RECEIVE NOT STALLED?

(OSTALL0 = 0)

ENDPOINT 0 RECEIVE READY TO RECEIVE?

(RX0E = 1) AND (RXD0F = 0)

RECEIVE CONTROL ENDPOINT

INTERRUPT ENABLED?

VALID TRANSACTION

INTERRUPT GENERATED

SEND STALL

HANDSHAKE

SEND NAK

HANDSHAKE

NO RESPONSE FROM

USB FUNCTION

IGNORE TRANSACTION

M68HC08 Datasheet(PDF) 202 Page - Freescale Semiconductor, Inc

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