FCY = 4 MHz
Desired Baud Rate = 9600
What is the value we must put in BRG register?
BRG = ?
To calculate the value to put in the BRG (Baud Rate Generator) register, we can use the following formula:
BRG = (FCY / (16 * Desired Baud Rate)) - 1
Plugging in the given values:
BRG = (4 MHz / (16 * 9600)) - 1
Simplifying:
BRG = (4000000 / 153600) - 1
BRG ≈ 25.98
Since the BRG value must be an integer, we will round up to the nearest whole number:
BRG = 26
Calculated Baud rate?
Error?
To calculate the calculated baud rate, we can use the following formula:
Calculated Baud Rate = FCY / (16 * (BRG + 1))
Plugging in the given values:
Calculated Baud Rate = 4 MHz / (16 * (26 + 1))
Simplifying:
Calculated Baud Rate = 4000000 / (16 * 27)
Calculated Baud Rate ≈ 9259.26
Now, to calculate the error:
Error = (Calculated Baud Rate - Desired Baud Rate) / Desired Baud Rate * 100
Error = (9259.26 - 9600) / 9600 * 100
Error ≈ -3.59%
Therefore, the calculated baud rate is approximately 9259.26 with an error of approximately -3.59%.
To calculate the value that needs to be put in the BRG (Baud Rate Generator) register, you will need to use the formula:
BRG = [(FCY / Desired Baud Rate) / 16] - 1
In this case, FCY is given as 4 MHz and the desired Baud Rate is given as 9600.
So, substituting these values into the formula:
BRG = [(4,000,000 / 9600) / 16] - 1
Simplifying this:
BRG = 26.042 - 1
Therefore, the value that needs to be put in the BRG register is approximately 25.