mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 297
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mc9s12e256
Manufacturer Part Number
mc9s12e256
Description
Hcs12 Microcontrollers 16-bit Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12E256.pdf
(602 pages)
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Chapter 10
Inter-Integrated Circuit (IICV2)
10.1
The inter-IC bus (IIC) is a two-wire, bidirectional serial bus that provides a simple, efficient method of
data exchange between devices. Being a two-wire device, the IIC bus minimizes the need for large
numbers of connections between devices, and eliminates the need for an address decoder.
This bus is suitable for applications requiring occasional communications over a short distance between a
number of devices. It also provides flexibility, allowing additional devices to be connected to the bus for
further 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 clock/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.
10.1.1
The IIC module has the following key features:
10.1.2
The IIC functions the same in normal, special, and emulation modes. It has two low power modes: wait
and stop modes.
Freescale Semiconductor
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Compatible with I2C bus standard
Multi-master operation
Software programmable for one of 256 different serial clock frequencies
Software selectable acknowledge bit
Interrupt driven byte-by-byte data transfer
Arbitration lost interrupt with automatic mode switching from master to slave
Calling address identification interrupt
Start and stop signal generation/detection
Repeated start signal generation
Acknowledge bit generation/detection
Bus busy detection
Introduction
Features
Modes of Operation
MC9S12E256 Data Sheet, Rev. 1.08
297
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