Specifications

mikroElektronika | Free Online Book | PIC Microcontrollers | Chapter 6: Serial Communication Modules

In Short:

In order to establish serial communication in I²C mode, the following should be done:

Setting Module and Sending Address:

● Value to determine baud rate should be written to the SSPADD register;

● SlewRate control should be turned off by setting the SMP bit of the SSPSTAT register;

● In order to select Master mode, binary value 1000 should be written to the SSPM3-SSPM0 bits of the SSPCON1

● The SEN bit of the SSPCON2 register should be set (START condition);

● The SSPIF bit is automatically set at the end of START condition when the module is ready to operate. It should be

cleared;

● Slave address should be written to the SSPBUF register; and

● When the byte is sent, the SSPIF bit (interrupt) is automatically set when the acknowledge bit has been received

from the Slave device.

Data Transmit:

● Data is to be send should be written to the SSPBUF register;

● When the byte is sent, the SSPIF bit (interrupt) is automatically set upon the acknowledge bit has been received

from Slave device; and

● In order to inform the Slave device that transmit is complete, STOP condition should be initiated by setting the PEN

bit of the SSPCON register.

Data Receive:

● In order to enable receive the RSEN bit of the SSPCON2 register should be set;

● The SSPIF bit signals data receive. When data is read from the SSPBUF register, the ACKEN bit of the SSPCON2

● In order to inform Slave device that transmit is complete, the STOP condition should be initiated by setting the PEN

bit of the SSPCON register.

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