參數(shù)資料
型號(hào): ST72T774S9T1
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
封裝: TQFP-44
文件頁數(shù): 132/144頁
文件大?。?/td> 1280K
代理商: ST72T774S9T1
ST72774/ST727754/ST72734
88/144
IC SINGLE MASTER BUS INTERFACE (Cont’d)
Acknowledge may be enabled and disabled by
software.
The speed of the I2C interface may be selected
between Standard (0-100KHz) and Fast I2C (100-
400KHz).
SDA/SCL Line Control
Transmitter mode: the interface holds the clock
line low before transmission to wait for the
microcontroller to write the byte in the Data
Register.
Receiver mode: the interface holds the clock line
low after reception to wait for the microcontroller to
read the byte in the Data Register.
The SCL frequency (Fscl) is controlled by a
programmable clock divider which depends on the
I2C bus mode.
When the I2C cell is enabled, the SDA and SCL
ports must be configured as floating open-drain
output or floating input. In this case, the value of
the external pull-up resistance used depends on
the application.
When the I2C cell is disabled, the SDA and SCL
ports revert to being standard I/O port pins.
Figure 53. I2C Interface Block Diagram
DATA REGISTER (DR)
DATA SHIFT REGISTER
CLOCK CONTROL REGISTER (CCR)
STATUS REGISTER 1 (SR1)
CONTROL REGISTER (CR)
SDAI
SCLI
CONTROL LOGIC
STATUS REGISTER 2 (SR2)
INTERRUPT
CLOCK CONTROL
DATA CONTROL
SCL
SDA
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