Reveal d' Technology: Online

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Friday, January 29, 2016

It is a must to set SPBRG value, when interfacing with UART/USART device with PIC micro controllers.

The formula to calculate SPBRG is given below

Error can be calculated by

Where Fosc is the frequency of the crystal used in PIC micro eg: 20MHz. And Baud Rate is the desired required baud rate.

The tool below can be used to calculate the SPBRG and Error %.

Crystal frequency :

Desired Baud rate :

Is Synchronous

Result: Use calculate button

It is a must to set SSPADD value, when interfacing with I2C device with PIC micro controllers.

The formula to calculate SSPADD is given below

Where Fosc is the frequency of the crystal used in PIC micro eg: 20MHz. And Bit Rate is the desired frequency for the I2C device.

The tool below can be used to calculate the SSPADD.

Crystal frequency :
Bit Rate for I2C :

Result: In HEX = 0x31 , In Decimal = 49