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C8051F380/1/2/3/4/5/6/7/C
21. Universal Serial Bus Controller (USB0)
C8051F380/1/2/3/4/5/6/7/C devices include a complete Full/Low Speed USB function for USB peripheral
implementations. The USB Function Controller (USB0) consists of a Serial Interface Engine (SIE), USB
Transceiver (including matching resistors and configurable pull-up resistors), 1 kB FIFO block, and clock
recovery mechanism for crystal-less operation. No external components are required. The USB Function
Controller and Transceiver is Universal Serial Bus Specification 2.0 compliant.
Transceiver
Serial Interface Engine (SIE)
Endpoint0
VDD
D+
IN/OUT
USB
Data
Transfer
Endpoint1
Control,
Status, and
CIP-51 Core
OUT
D-
Control
IN
Endpoint2
Endpoint3
Interrupt
Registers
IN
IN
OUT
OUT
USB FIFOs
(1k RAM)
Figure 21.1. USB0 Block Diagram
Important Note: This document assumes a comprehensive understanding of the USB Protocol. Terms and
abbreviations used in this document are defined in the USB Specification. We encourage you to review the
latest version of the USB Specification before proceeding.
Note: The C8051F380/1/2/3/4/5/6/7/C cannot be used as a USB Host device.
21.1. Endpoint Addressing
A total of eight endpoint pipes are available. The control endpoint (Endpoint0) always functions as a bi-
directional IN/OUT endpoint. The other endpoints are implemented as three pairs of IN/OUT endpoint
pipes:
172
Rev. 1.4
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