参数资料
型号: ST72P651AR6T1/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, TQFP-64
文件页数: 8/160页
文件大小: 979K
代理商: ST72P651AR6T1/XXX
ST7265x
105/160
11.7 I C SINGLE MASTER BUS INTERFACE (I2C)
11.7.1 Introduction
The I2C Bus Interface serves as an interface be-
tween 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 I C mode (400kHz).
11.7.2 Main Features
– Parallel bus /I2C protocol converter
– Interrupt generation
– Standard I2C mode/Fast I2C mode
– 7-bit Addressing
s
I2C single Master Mode
–I2C bus busy flag
– End of byte transmission flag
– Transmitter/Receiver flag
– Clock generation
11.7.3 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 I
2C
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 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 con-
dition.
Communication Flow
The interface initiates a data transfer and gener-
ates 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 gen-
erated by software.
Data and addresses are transferred as 8-bit bytes,
MSB first. The first byte following the start condi-
tion 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 Fig-
ure 64.
Figure 64. I2C BUS Protocol
SCL
SDA
12
8
9
MSB
ACK
STOP
START
CONDITION
VR02119B
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