A13 datasheet(41/55 Pages) ETC2

41 / 55 page

Allwinner Technology CO., Ltd.

A13 Datasheet v1.30

December 10, 2012

15.

Two Wire Interface

15.1.

Overview

This Two Wire Controller is an interface between CPU host and the serial 2-Wire bus, which

supports all standard 2-Wire transfer, including Slave and Master. The communication to the

2-Wire bus is carried out on a byte-wise basis using interrupt or polled handshaking. This 2-Wire

Controller can be operated in standard mode (100K bps) or fast-mode (up to 400K bps). Multiple

Masters and 10-bit addressing Mode are supported for this specified application. General Call

Addressing is supported in Slave mode.

The 2-Wire Controller features:



Software-programmable for Slave or Master



Support Repeated START signal



Support Multi-master systems



Support 10-bit addressing with 2-Wire bus



Perform arbitration and clock synchronization



Own address and General Call address detection



Interrupt on address detection



Support speed up to 400K bits/s („fast mode‟)



Support operation from a wide range of input clock frequencies

15.2.

TWI Controller Signal Description

TWIx=TWI[2:0]

Signal Name

Description

Type

TWIx_SCK

TWI-BUS Clock for Channel x

I/O

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