ST72754 datasheet(88/144 Pages) STMICROELECTRONICS

Part #	ST72754

Description	8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C

PDF	144 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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88 / 144 page

ST72774/ST727754/ST72734

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I²C 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

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

ST72754 Datasheet(PDF) 88 Page - STMicroelectronics