Baud Rate Calculator

Baud Rate Formula:

\[ \text{Baud Rate} = \frac{\text{Clock}}{\text{Prescaler} \times 16} \]

Baud Rate (baud):

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1. What is a Baud Rate Calculator?

Definition: This calculator estimates the baud rate for UART communication based on system clock frequency and prescaler value.

Purpose: It helps embedded systems developers configure UART communication parameters for proper serial data transmission.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \text{Baud Rate} = \frac{\text{Clock}}{\text{Prescaler} \times 16} \]

Where:

Baud Rate — Data transmission rate in bits per second (baud)
Clock — System clock frequency in Hertz (Hz)
Prescaler — Integer divisor for clock scaling

Explanation: The system clock is divided by the prescaler and 16 (for oversampling) to determine the baud rate.

3. Importance of Baud Rate Calculation

Details: Proper baud rate configuration ensures reliable serial communication between devices. Mismatched baud rates cause data corruption.

4. Using the Calculator

Tips: Enter the system clock frequency in Hz and the prescaler value (minimum 1). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is 16 used in the formula?
A: Most UART implementations use 16x oversampling to improve noise immunity and synchronization.

Q2: What are common baud rate values?
A: Common values include 9600, 19200, 38400, 57600, and 115200 baud.

Q3: What if I get non-standard baud rates?
A: The actual baud rate may differ slightly due to integer prescaler limitations. Choose the closest standard value.

Q4: How does clock frequency affect baud rate?
A: Higher clock frequencies allow for higher baud rates or more precise standard baud rate generation.

Q5: What's the relationship between baud rate and bit rate?
A: For simple UART (1 start bit, 8 data bits, 1 stop bit), bit rate ≈ baud rate × 0.8.