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The datasheet for the USBFS component states that the PSoC 5 requires an external crystal and seems to suggest that this is not the case for PSoC 3 and PSoC 5LP. AN73503 http://www.cypress.com/?rID=57561 states that "Since the projects involve the use of USB component, in case of PSoC 5LP it is mandatory to use an external 24 MHz crystal." Is this a typo in AN73503 or should I include a crystal in my PSoC 5LP design if I intend to use the USBFS component? Julian
This application note shows you how to do simple data transfer with PSoC 3 and PSoC 5LP using USB HID. The PSoC devices include a dedicated Full-speed (FS) 12 Mbps USB 2.0 peripheral, which uses an internal oscillator – a crystal is not required. The PSoC Creator IDE and the USBFS Component make it possible to quickly build an application. A mouse and a joystick are used as examples.