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参数资料
型号： ST72E734J6D0
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP42
封装： CERAMIC, SDIP-42
文件页数： 131/144页
文件大小： 1280K
代理商： ST72E734J6D0
ST72774/ST727754/ST72734
87/144
4.7 IC SINGLE MASTER BUS INTERFACE (I2C)
4.7.1 Introduction
The I2C Bus Interface serves as an interface
between the microcontroller and the serial I2C bus.
It provides single master functions, and controls all
I2C bus-specific sequencing, protocol and timing.
It supports fast IC mode (400kHz).
4.7.2 Main Features
– Parallel bus /I2C protocol converter
– Interrupt generation
– Standard I2C mode /Fast I2C mode
– 7-bit Addressing
s
I2C single Master Mode
– End of byte transmission flag
– Transmitter/Receiver flag
– Clock generation
4.7.3 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
software.
Mode Selection
The interface can operate in the two following
modes:
– Master transmitter/receiver
By default, it is idle.
The interface automatically switches from idle to
master after it generates a START condition and
from master to idle after it generates a STOP
condition.
Communication Flow
The
interface
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 by software.
Data and addresses are transferred as 8-bit bytes,
MSB first. The first byte following the start
condition is the address byte.
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
Figure 52.
Figure 52. I2C BUS Protocol
SCL
SDA
12
8
9
MSB
ACK
STOP
START
CONDITION
VR02119B
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