Microchip PIC32MX250F128B Manual

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Side 1/72

USB On-The-Go

(OTG)

Section 27. USB On-The-Go (OTG)

HIGHLIGHTS

This section of the manual contains the following major topics:

27.1 Introduction .................................................................................................................. 27-2

27.2 Control Registers ......................................................................................................... 27-4

27.3 Operation ................................................................................................................... 27-36

27.4 Host Mode Operation................................................................................................. 27-51

27.5 Interrupts.................................................................................................................... 27-59

27.6 I/O Pins ...................................................................................................................... 27-62

27.7 Operation in Debug and Power-Saving Modes.......................................................... 27-64

27.8 Effects of a Reset....................................................................................................... 27-66

27.9 Related Application Notes.......................................................................................... 27-67

PIC32 Family Reference Manual

27.1 INTRODUCTION

The PIC32 USB OTG module includes the following features:

• USB Full-Speed Support for Host and Device

• Low-Speed Host Support

• USB On-The-Go (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 Bus Master to Access System RAM and Flash

• USB OTG module does not require the PIC32 DMA module for its operation

The USB OTG 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 OTG module consists of the clock generator, the USB voltage comparators, the trans-

ceiver, the Serial Interface Engine (SIE), a dedicated USB Bus Master, pull-up and pull-down

resistors and the register interface. A block diagram of the USB OTG module is presented in

Figure 27-1.

The clock generator provides the 48 MHz clock, which is required for USB full-speed and

low-speed communication. 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 Bus Master transfers

data between the data buffers in RAM and the SIE. The integrated 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.

Note: This family reference manual section is meant to serve as a complement to device

data sheets. Depending on the device variant, this manual section may not apply to

all PIC32 devices.

Please consult the note at the beginning of the “USB On-The-Go (OTG)” chapter

in the current device data sheet to check whether this document supports the device

you are using.

Device data sheets and family reference manual sections are available for

download from the Microchip Worldwide Web site at: http://www.microchip.com

IMPORTANT: 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 satisfying any

applicable licensing obligations.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	PIC32MX250F128B

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