参数资料
型号: ST72F651AR6T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, ROHS COMPLIANT, TQFP-64
文件页数: 9/161页
文件大小: 2656K
代理商: ST72F651AR6T1
ST72651AR6
106/161
Doc ID 7215 Rev 4
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 (up to 100KHz) and Fast I2C
(up to 400KHz).
SDA/SCL Line Control
Transmitter mode: the interface holds the clock
line low before transmission to wait for the micro-
controller 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 pro-
grammable 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 inputs. 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 63. I2C Interface Block Diagram
DATA REGISTER (DR)
DATA SHIFT REGISTER
CLOCK CONTROL REGISTER (CCR)
STATUS REGISTER 1 (SR1)
CONTROL REGISTER (CR)
CONTROL LOGIC
STATUS REGISTER 2 (SR2)
INTERRUPT
CLOCK CONTROL
DATA CONTROL
SCL or SCLI
SDA or SDAI
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