Calculation of Baudrate and SPBRG - Parallel Ports and Serial Communication | Summary and Q&A

TL;DR

This content explains the concept of baud rate and how to calculate the SPBRG count needed for a specific baud rate.

Key Insights

• ☠️ Baud rate and SPBRG count are crucial in determining the speed of data transfer in serial communication.
• ☠️ The SPBRG count can be adjusted programmatically to match desired baud rates based on standard requirements.
• ☠️ The higher the baud rate, the faster the data transmission, but it also depends on the chosen crystal frequency.

Transcript

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Questions & Answers

Q: What is the difference between baud rate and SPBRG count?

Baud rate represents the speed of data transfer in bps, while SPBRG count is the value stored in an 8-bit register that determines the baud rate.

Q: How is the SPBRG count calculated?

The formula for calculating the SPBRG count is: count = (crystal frequency / (desired baud rate * 64)) - 1. The result should be rounded to the nearest whole number.

Q: Can the baud rate be adjusted according to different standards?

Yes, the baud rate can be adjusted by programming the SPBRG count to match the desired baud rate specified by the standards.

Q: What happens if the SPBRG count value is set too high or too low?

If the SPBRG count value is set too high, it may result in sending garbage data. If it is set too low, the data transmission may be slower than intended.

Summary & Key Takeaways

• Baud rate and SPBRG count are essential in serial communication, with baud rate representing the speed of data transfer in bits per second (bps).

• The SPBRG count is programmable and can be adjusted according to standard requirements for a given crystal frequency.

• The formula for calculating the SPBRG count is described, and various standard baud rate values are provided.