FCY = 4 MHz
Desired Baud Rate = 9600
What is the value we must put in BRG register?
To calculate the value to be set in the BRG (Baud Rate Generator) register, you can use the formula:
BRG = (FCY / (16 * Desired Baud Rate)) - 1
Plugging in the given values:
BRG = (4 MHz / (16 * 9600)) - 1
BRG = (4000000 / 153600) - 1
BRG ≈ 25.99 - 1
BRG ≈ 24.99
Since the BRG register typically takes integer values, you would round this value down to the nearest whole number. Therefore, the value to be set in the BRG register would be 24.
Calculated Baud rate?
Error?
The calculated Baud rate is not 9600.
Using the formula provided above, the calculated Baud rate is:
Baud rate = FCY / (16 * (BRG + 1))
Baud rate = 4000000 / (16 * (24 + 1))
Baud rate = 4000000 / (16 * 25)
Baud rate = 4000000 / 400 = 10000
So the calculated Baud rate is 10000, not 9600.
Error:
The calculated Baud rate is higher than the desired Baud rate. This means that the actual Baud rate will be higher than the desired Baud rate, which may result in data transmission errors and synchronization issues between the sender and receiver. To achieve a Baud rate of 9600, you may need to adjust the value in the BRG register or use a different clock frequency.