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PIC18F4550ESOSQTP Datasheet(PDF) 165 Page - Microchip Technology |
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PIC18F4550ESOSQTP Datasheet(HTML) 165 Page - Microchip Technology |
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165 / 430 page  © 2007 Microchip Technology Inc. Preliminary DS39632D-page 163 PIC18F2455/2550/4455/4550 17.0 UNIVERSAL SERIAL BUS (USB) This section describes the details of the USB peripheral. Because of the very specific nature of the module, knowledge of USB is expected. Some high-level USB information is provided in Section 17.10 “Overview of USB” only for application design reference. Designers are encouraged to refer to the official specification published by the USB Imple- menters Forum (USB-IF) for the latest information. USB Specification Revision 2.0 is the most current specification at the time of publication of this document. 17.1 Overview of the USB Peripheral The PIC18FX455/X550 device family contains a full-speed and low-speed compatible USB Serial Inter- face Engine (SIE) that allows fast communication between any USB host and the PIC® microcontroller. The SIE can be interfaced directly to the USB, utilizing the internal transceiver, or it can be connected through an external transceiver. An internal 3.3V regulator is also available to power the internal transceiver in 5V applications. Some special hardware features have been included to improve performance. Dual port memory in the device’s data memory space (USB RAM) has been supplied to share direct memory access between the microcontroller core and the SIE. Buffer descriptors are also provided, allowing users to freely program end- point memory usage within the USB RAM space. A Streaming Parallel Port has been provided to support the uninterrupted transfer of large volumes of data, such as isochronous data, to external memory buffers. Figure 17-1 presents a general overview of the USB peripheral and its features. FIGURE 17-1: USB PERIPHERAL AND OPTIONS UOE(1) 1Kbyte USB RAM USB SIE USB Control and VM(1) VP(1) RCV(1) VMO(1) VPO(1) Transceiver External Transceiver P P EN 3.3V Regulator D+ D- Internal Pull-ups UOE VUSB External 3.3V Supply(3) FSEN UPUEN UTRDIS USB Clock from the Oscillator Module VREGEN Optional External Pull-ups(2) (Low (Full PIC18FX455/X550 Family SPP7:SPP0 USB Bus USB Bus FS Speed) Speed) Note 1: This signal is only available if the internal transceiver is disabled (UTRDIS = 1). 2: The internal pull-up resistors should be disabled (UPUEN = 0) if external pull-up resistors are used. 3: Do not enable the internal regulator when using an external 3.3V supply. Configuration CK1SPP CK2SPP CSSPP OESPP |
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