ST7263BEx datasheet(97/186 Pages) STMICROELECTRONICS

97 / 186 page

ST7263Bxx

On-chip peripherals

Doc ID 7516 Rev 8

97/186

11.4

USB interface (USB)

11.4.1

Introduction

The USB Interface implements a low-speed function interface between the USB and the

ST7 microcontroller. It is a highly integrated circuit which includes the transceiver, 3.3

voltage regulator, SIE and DMA. No external components are needed apart from the

external pull-up on USBDM for low speed recognition by the USB host. The use of DMA

architecture allows the endpoint definition to be completely flexible. Endpoints can be

configured by software as in or out.

11.4.2

Main features

●

USB Specification Version 1.1 Compliant

●

Supports Low-Speed USB Protocol

●

Two or Three Endpoints (including default one) depending on the device (see device

feature list and register map)

●

CRC generation/checking, NRZI encoding/decoding and bit-stuffing

●

USB Suspend/Resume operations

●

DMA Data transfers

●

On-Chip 3.3 V Regulator

●

On-Chip USB Transceiver

11.4.3

Functional description

The block diagram in Figure 44, gives an overview of the USB interface hardware.

For general information on the USB, refer to the “Universal Serial Bus Specifications”

document available at http//:www.usb.org.

Serial interface engine

The SIE (Serial Interface Engine) interfaces with the USB, via the transceiver.

The SIE processes tokens, handles data transmission/reception, and handshaking as

required by the USB standard. It also performs frame formatting, including CRC generation

and checking.

Endpoints

The Endpoint registers indicate if the microcontroller is ready to transmit/receive, and how

many bytes need to be transmitted.

DMA

When a token for a valid Endpoint is recognized by the USB interface, the related data

transfer takes place, using DMA. At the end of the transaction, an interrupt is generated.

Interrupts

By reading the Interrupt Status register, application software can know which USB event has

occurred.

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