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PIC32MX3XX/4XX
11.0
USB ON-THE-GO (OTG)
The PIC32MX USB module includes the following
features:
Note 1: This data sheet summarizes the features
of the PIC32MX3XX/4XX family of
devices. It is not intended to be a compre-
hensive reference source. To comple-
ment the information in this data sheet,
refer to Section 27. “USB On-The-Go
(OTG)” (DS61126) of the “PIC32MX
Family Reference Manual” , which is avail-
able from the Microchip web site
(www.microchip.com/PIC32).
2: Some registers and associated bits
described in this section may not be avail-
“Memory Organization” in this data
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USB Full-Speed Support for Host and Device
Low-Speed Host Support
USB OTG Support
Integrated Signaling Resistors
Integrated Analog Comparators for V BUS
Monitoring
Integrated USB Transceiver
Transaction Handshaking Performed by
Hardware
Endpoint Buffering Anywhere in System RAM
Integrated DMA to Access System RAM and
Flash
sheet for device-specific register and bit
information.
The Universal Serial Bus (USB) module contains ana-
log and digital components to provide a USB 2.0 full-
speed and low-speed embedded host, full-speed
device, or OTG implementation with a minimum of
external components. This module in Host mode is
intended for use as an embedded host and therefore
does not implement a UHCI or OHCI controller.
The USB module consists of the clock generator, the
USB voltage comparators, the transceiver, the Serial
Interface Engine (SIE), a dedicated USB DMA control-
ler, pull-up and pull-down resistors, and the register
interface. A block diagram of the PIC32MX USB OTG
The clock generator provides the 48 MHz clock
required for USB full-speed and low-speed communi-
cation. The voltage comparators monitor the voltage on
the V BUS pin to determine the state of the bus. The
transceiver provides the analog translation between
the USB bus and the digital logic. The SIE is a state
machine that transfers data to and from the endpoint
buffers, and generates the hardware protocol for data
transfers. The USB DMA controller transfers data
between the data buffers in RAM and the SIE. The inte-
grated pull-up and pull-down resistors eliminate the
need for external signaling components. The register
interface allows the CPU to configure and
communicate with the module.
? 2010 Microchip Technology Inc.
Note:
The implementation and use of the USB
specifications, as well as other third-party
specifications or technologies, may
require licensing; including, but not limited
to, USB Implementers Forum, Inc. (also
referred to as USB-IF). The user is fully
responsible for investigating and satisfy-
ing any applicable licensing obligations.
DS61143G-page 99
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