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Sheet目录3841

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2011-2012 Microchip Technology Inc.

Preliminary

DS61168D-page 121

PIC32MX1XX/2XX

10.0 USB ON-THE-GO (OTG)

The Universal Serial Bus (USB) module contains

analog 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 PIC32 USB OTG

module is presented in Figure 10-1.

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 VBUS 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

configure

and

communicate with the module.

The PIC32 USB module includes the following

features:

USB Full-speed support for host and device

Low-speed host support

USB OTG support

Integrated signaling resistors

Integrated analog comparators for VBUS

monitoring

Integrated USB transceiver

Transaction handshaking performed by hardware

Endpoint buffering anywhere in system RAM

Integrated DMA to access system RAM and Flash

Note 1: This data sheet summarizes the features

of the PIC32MX1XX/2XX family of

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 27. “USB On-

The-Go (OTG)” (DS61126) in the “PIC32

Family Reference Manual”, which is

available from the Microchip web site

(www.microchip.com/PIC32).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

Note:

The implementation and use of the USB

specifications, as well as other third party

specifications

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

satisfying

any

applicable

licensing

obligations.

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