CY7C63722/23

CY7C63742/43

enCoRe™ USB

Combination Low-Speed USB & PS/2

Peripheral Controller-Designing A Low Cost USB-PS/2 Combination Interface Mouse

with the Cypress Semiconductor CY7C63723 enCoRe　USB

Microcontroller

Introduction

The Universal Serial Bus (USB) is an industry

standard serial interface between a computer and

peripherals such as a mouse, joystick, keyboard,

UPS, etc. This application note describes how a

cost-effective combination USB-PS/2 mouse can

be built using the Cypress Semiconductor

CY7C63723 USB microcontroller. The document

starts with the basic operations of a computer

mouse peripheral followed by an introduction to

the CY7C63723 USB microcontroller. A

schematic of the CY7C63723 USB

microcontroller to the optics and buttons of a

standard mouse can be found in the Hardware

Implementation Section. The software section of

this application note describes the architecture of

the firmware required to implement the USB

and PS/2 mouse functions. This application note

assumes that the reader is familiar with the

CY7C63723 USB micr