HC705JB2GRSSLASHH datasheet(70/128 Pages) NXP

70 / 128 page

GENERAL RELEASE SPECIFICATION

August 28, 1998

UNIVERSAL SERIAL BUS MODULE

MC68HC705JB2

10-2

REV 1.1

10.2

OVERVIEW

This section provides an overview of the Universal Serial Bus (USB) module in the

MC68HC705JB2. This USB module is designed to serve as a low-speed (LS)

USB device per the Universal Serial Bus Speciﬁcation Rev 1.0. Three types of

USB data transfers are supported: control, interrupt, and bulk (transmit only).

Endpoint 0 functions as a receive/transmit control endpoint. Endpoints 1 and 2

can function as interrupt or bulk, but only in the transmit direction.

A block diagram of the USB module is shown Figure 10-1. The USB module

manages communications between the host and the USB function. The module is

partitioned into four functional blocks. These blocks consist of a 3.3 volt regulator,

a dual function transceiver, the USB control logic, and the endpoint registers. The

blocks are further detailed in Section 10.4.

Figure 10-1. USB Block Diagram

D+

D–

RCV

VPIN

VMIN

VPOUT

VMOUT

REGULATOR

3.3 V OUT

CPU BUS

USB REGISTERS

USB

Upstream

Port

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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