MSP430 UART Register Calculator

Overview

The MSP430 UART Register Calculator is a tool designed to help engineers and hobbyists configure the UART (Universal Asynchronous Receiver/Transmitter) module of MSP430 microcontrollers. It calculates the necessary register values to achieve a desired baud rate, given the system clock frequency.

Key Registers

• UCAxBR0 and UCAxBR1: These registers together form a 16-bit value that determines the basic baud rate.
• UCAxMCTL: This register provides fine-tuning for the baud rate, allowing for more accurate rates.

Calculation Process

1. Calculate N = round(Clock Frequency / Desired Baud Rate)
2. Set UCBRx = N & 0xFFFF
3. Set UCAxBR0 = UCBRx & 0xFF
4. Set UCAxBR1 = (UCBRx >> 8) & 0xFF
5. Calculate UCAxMCTL = round(((Clock Frequency / Desired Baud Rate) - N) * 8) & 0xFF