M68HC08 datasheet(193/332 Pages) FREESCALE

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Universal Serial Bus Module (USB)

MC68HC908JB16 — Rev. 1.1

Technical Data

Freescale Semiconductor

Universal Serial Bus Module (USB)

193

11.8.8 USB Control Register 3

TX1ST — Endpoint 0 Transmit First Flag

This read-only bit is set if the endpoint 0 data transmit flag (TXD0F) is

set when the USB control logic is setting the endpoint 0 data receive

flag (RXD0F). In other words, if an unserviced endpoint 0 transmit flag

is still set at the end of an endpoint 0 reception, then this bit will be set.

This bit lets the firmware know that the endpoint 0 transmission

happened before the endpoint 0 reception.

Reset clears this bit.

1 = IN transaction occurred before SETUP/OUT

0 = IN transaction occurred after SETUP/OUT

TX1STR — Clear Endpoint 0 Transmit First Flag

Writing a logic 1 to this write-only bit will clear the TX1ST bit if it is set.

Writing a logic 0 to the TX1STR has no effect. Reset clears this bit.

OSTALL0 — Endpoint 0 Force STALL Bit for OUT token

This read/write bit causes endpoint 0 to return a STALL handshake

when polled by an OUT token by the USB host controller. The USB

hardware clears this bit when a SETUP token is received. Reset

clears this bit.

1 = Send STALL handshake

0 = Default

Address:

$001A

Bit 7

654321

Bit 0

Read:

TX1ST

OSTALL0 ISTALL0

PULLEN ENABLE2 ENABLE1

Write:

TX1STR

Reset:

00000

= Unimplemented

* PULLEN bit is reset by POR or LVI reset only.

Figure 11-22. USB Control Register 3 (UCR3)

M68HC08 Datasheet(PDF) 193 Page - Freescale Semiconductor, Inc

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