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| 型号： | ST72C215G2M7 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
| 封装： | 0.300 INCH, PLASTIC, SOIC-28 |
| 文件页数： | 112/140页 |
| 文件大小： | 2246K |
| 代理商： | ST72C215G2M7 |
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ST72104G, ST72215G, ST72216G, ST72254G
73/140
11.4 I2C BUS INTERFACE (I2C)
11.4.1 Introduction
The I2C Bus Interface serves as an interface be-
tween the microcontroller and the serial I2C bus. It
provides both multimaster and slave functions,
and controls all I2C bus-specific sequencing, pro-
tocol, arbitration and timing. It supports fast I2C
mode (400kHz).
11.4.2 Main Features
Parallel-bus/I
2C protocol converter
Multi-master capability
7-bit/10-bit Addressing
Transmitter/Receiver flag
End-of-byte transmission flag
Transfer problem detection
I2C Master Features:
Clock generation
I
2C bus busy flag
Arbitration Lost Flag
End of byte transmission flag
Transmitter/Receiver Flag
Start bit detection flag
Start and Stop generation
I2C Slave Features:
Stop bit detection
I
2C bus busy flag
Detection of misplaced start or stop condition
Programmable I
2C Address detection
Transfer problem detection
End-of-byte transmission flag
Transmitter/Receiver flag
11.4.3 General Description
In addition to receiving and transmitting data, this
interface converts it from serial to parallel format
and vice versa, using either an interrupt or polled
handshake. The interrupts are enabled or disabled
by software. The interface is connected to the I2C
bus by a data pin (SDAI) and by a clock pin (SCLI).
It can be connected both with a standard I2C bus
and a Fast I2C bus. This selection is made by soft-
ware.
Mode Selection
The interface can operate in the four following
modes:
– Slave transmitter/receiver
– Master transmitter/receiver
By default, it operates in slave mode.
The interface automatically switches from slave to
master after it generates a START condition and
from master to slave in case of arbitration loss or a
STOP generation, allowing then Multi-Master ca-
pability.
Communication Flow
In Master mode, it initiates a data transfer and
generates the clock signal. A serial data transfer
always begins with a start condition and ends with
a stop condition. Both start and stop conditions are
generated in master mode by software.
In Slave mode, the interface is capable of recog-
nising its own address (7 or 10-bit), and the Gen-
eral Call address. The General Call address de-
tection may be enabled or disabled by software.
Data and addresses are transferred as 8-bit bytes,
MSB first. The first byte(s) following the start con-
dition contain the address (one in 7-bit mode, two
in 10-bit mode). The address is always transmitted
in Master mode.
A 9th clock pulse follows the 8 clock cycles of a
byte transfer, during which the receiver must send
an acknowledge bit to the transmitter. Refer to Fig-
ure 1.
Figure 43. I2C BUS Protocol
SCL
SDA
12
8
9
MSB
ACK
STOP
START
CONDITION
VR02119B
相关PDF资料 |
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|---|---|
| ST72C104G2B5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
| ST72C104G1M6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
| ST72C104G1B5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
| ST72C104G1M5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
| ST72C104G2M3 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72C216G1B6 | 功能描述:8位微控制器 -MCU Flash 4K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C216G1M6 | 功能描述:8位微控制器 -MCU Flash 4K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C254G1B6 | 功能描述:8位微控制器 -MCU Flash 4K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C254G1M6 | 功能描述:8位微控制器 -MCU Flash 4K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C254G2B1 | 制造商:STMicroelectronics 功能描述:8-BIT MICROCONTROLLER - Bulk |
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