68HC705JB4 datasheet(68/134 Pages) FREESCALE

68 / 134 page

GENERAL RELEASE SPECIFICATION

February 24, 1999

MOTOROLA

UNIVERSAL SERIAL BUS MODULE

MC68HC05JB4

10-2

REV 2

10.2

OVERVIEW

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

MC68HC05JB4. 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

10.2.1 USB Protocol

Figure 10-2

shows

the

various

transaction

types

supported

the

MC68HC05JB4 USB module. The transactions are portrayed as error free. The

effect of errors in the data ﬂow are discussed later.

D+

D–

RCV

VPIN

VMIN

VPOUT

VMOUT

REGULATOR

3.3V 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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