I2C tutorial

[Electronics4you]

Hi All,

During my studying of the I2C I now have some questions. When I write an adress to a device e.g. PCF8583 I write (mikroC-code):

Soft_I2C_Write(0xA0);          // Address PCF8583

But what if I have 4 PCF8583's coupled to the PIC with I2C, what to write for communicating with one at a time?

Also when I write

Soft_I2C_Write(0);             // Write 0 to cents word
Soft_I2C_Write(0);             // Write 0 to seconds word
Soft_I2C_Write(0x30);          // Write 0x30 to minutes word
Soft_I2C_Write(0x11);          // Write 0x11 to hours word
Soft_I2C_Write(0x30);          // Write 0x24 to year/date word

Is the device programmed to have the data in that order and then sending data for the PIC?

 

[Nigel Goodwin]

With I2C each device is given it's own address, many IC's have configurable addresses, using pins you either ground or connect to 5V - if the devices address isn't configurable than you can only have one such device per bus.