HC08KL8GRSSLASHD datasheet(106/256 Pages) NXP

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Universal Serial Bus Module (USB)

General Release Specification

MC68HC08KL8 — Rev. 2.0

Universal Serial Bus Module (USB)

9.3 Overview

This section provides an overview of the universal serial bus (USB)

module developed for the MC68HC08KL8. 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 in Figure 9-1. 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 later in this section (see 9.5 Hardware Description).

Figure 9-1. USB Block Diagram

D +

D –

USB

UPSTREAM

PORT

RCV

VPIN

VMIN

VPOUT

VMOUT

REGULATOR

3.3 V OUT

CPU BUS

USB REGISTERS

REGOUT

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC08KL8GRS/D Datasheet(PDF) 106 Page - NXP Semiconductors