System Overview - Motorola M68HC08 Designer Reference Manual

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Universal Serial Bus (USB) Receiver

6.2 System Overview

DRM055

Freescale Semiconductor, Inc.

The receiver consists of:

•

The JB12

•

A button for identity device (ID) code setting

•

A in-circuit programming (ICP) connector

•

RF front-end circuitry

The functions of the JB12 are to handle the USB transactions, capture and

process data from RF receiver front end. The processed data is converted into

USB report format and sent to the host.

The ID button is used to interrupt the MCU for a new ID code detection. The

MCU will search if there is any ID code embedded in the RF data packet and

store the new ID in FLASH memory.

There is a transistor wakeup circuit connected at the IRQ pin and is controlled

by a I/O pin. The MCU will configure the wakeup circuit before entering stop

mode for power saving. The RC components connected at the transistor base

input will be charged up, and eventually turn on the transistor and pull low the

IRQ to wakeup the MCU.

The ICP interface is connected at port A. The ICP is used for future firmware

updating through the Cyclone Programming Tools.

Universal Serial Bus (USB) Receiver

For More Information On This Product,

Go to: www.freescale.com

High Data Rate Wireless USB Optical Mouse Solution

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