This application note provides information that will aid in thedevelopment of firmware for the Cypress CY7C63xxx familyof low-speed USB microcontrollers. The intention is to providefirmware developers with some useful insights into the intricaciesof the devices. This document is divided into two sections.Section 1 provides general firmware tips and techniquesto the firmware developer. Section 2 providesinformation on how to write firmware routines to perform USBcommunication.