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TWI2: 产品描述32-bit Embedded ASIC Core Peripheral; 文件大小46KB，共4页; 制造商Atmel (Microchip)

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TWI2概述

32-bit Embedded ASIC Core Peripheral

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Features

•

Compatible with Atmel Two-wire Interface Serial Memory and I²C Compatible

•

Devices

(Note:)

One, Two or Three Bytes for Slave Address

Sequential Read/Write Operations

Master, Multi-master and Slave Mode Operation

Bit Rate: Up to 400 Kbits

General Call Supported in Slave mode

See

Table 1-1

below for details on compatibility with I²C Standard.

Note:

1. Description

The Atmel Two-wire Interface (TWI) interconnects components on a unique two-wire

bus, made up of one clock line and one data line with speeds of up to 400 Kbits per

second, based on a byte-oriented transfer format. It can be used with any Atmel Two-

wire Interface bus Serial EEPROM and I²C compatible device such as Real Time

Clock (RTC), Dot Matrix/Graphic LCD Controllers and Temperature Sensor, to name

but a few. The TWI is programmable as a master or a slave with sequential or single-

byte access. Multiple master capability is supported. Arbitration of the bus is per-

formed internally and puts the TWI in slave mode automatically if the bus arbitration is

lost.

A configurable baud rate generator permits the output data rate to be adapted to a

wide range of core clock frequencies.

Below,

Table 1-1

lists the compatibility level of the Atmel Two-wire Interface in Master

Mode and a full I

C compatible device.

Table 1-1.

I2C Standard

Standard Mode Speed (100 KHz)

Fast Mode Speed (400 KHz)

7 or 10 bits Slave Addressing

START BYTE

(1)

Repeated Start (Sr) Condition

ACK and NACK Management

Slope control and input filtering (Fast mode)

Clock stretching

Note:

1. START + b000000001 + Ack + Sr

32-bit

Embedded ASIC

Core Peripheral

Two-wire

Interface (TWI2)

Summary

Atmel TWI compatibility with i2C Standard

Atmel TWI

Supported

Not Supported

Supported

Not Supported

Supported

NOTE:

This is a summary document.

The complete document is available

under NDA. For more information,

please contact your local Atmel sales

office.

6212BS–ATARM–21-May-07

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