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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� MCF5270CVM150R2
寤犲晢锛� Freescale Semiconductor
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 418/626闋�(y猫)
鏂囦欢澶у皬锛� 0K
鎻忚堪锛� IC MCU 32BIT 150MHZ 196-MAPBGA
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 750
绯诲垪锛� MCF527x
鏍稿績铏曠悊鍣細 Coldfire V2
鑺珨灏哄锛� 32-浣�
閫熷害锛� 150MHz
閫i€氭€э細 EBI/EMI锛屼互澶恫(w菐ng)锛孖²C锛孲PI锛孶ART/USART
澶栧湇瑷�(sh猫)鍌欙細 DMA锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 97
绋嬪簭瀛樺劜(ch菙)鍣ㄩ鍨嬶細 ROMless
RAM 瀹归噺锛� 64K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 1.4 V ~ 1.6 V
鎸暕鍣ㄥ瀷锛� 澶栭儴
宸ヤ綔婧害锛� -40°C ~ 85°C
灏佽/澶栨锛� 196-LBGA
鍖呰锛� 甯跺嵎 (TR)
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MCF5271 Reference Manual, Rev. 2
Freescale Semiconductor
25-1
Chapter 25
I2C Interface
25.1 Introduction
This chapter describes the MCF5271 I2C module, including I2C protocol, clock synchronization,
and I2C programming model registers. It also provides extensive programming examples.
25.2 Overview
I2C is a two-wire, bidirectional serial bus that provides a simple, efficient method of data
exchange, minimizing the interconnection between devices. This bus is suitable for applications
that require occasional communication between many devices over a short distance. The flexible
I2C bus allows additional devices to be connected to the bus for expansion and system
development.
The interface is designed to operate up to 100 Kbps with maximum bus loading and timing. The
device is capable of operating at higher baud rates, up to a maximum of the internal bus clock
divided by 20, with reduced bus loading. The maximum communication length and the number of
devices that can be connected are limited by a maximum bus capacitance of 400 pF.
The I2C system is a true multiple-master bus; it uses arbitration and collision detection to prevent
data corruption in the event that multiple devices attempt to control the bus simultaneously. This
feature supports complex applications with multiprocessor control and can be used for rapid
testing and alignment of end products through external connections to an assembly-line computer.
NOTE
The I2C module is designed to be compatible with the Philips I2C bus
protocol. For information on system configuration, protocol, and
restrictions, see The I2C Bus Specification, Version 2.1.
NOTE
The GPIO module must be configured to enable the peripheral
function of the appropriate pins (refer to Chapter 12, 鈥淕eneral
Purpose I/O Module鈥�) prior to configuring the I2C module.
25.3 Features
The I2C module has the following key features:
Compatibility with I2C bus standard version 2.1
Support for 3.3-V tolerant devices
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