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USART Introduction: UART Mode

18.1 USART Introduction: UART Mode

In asynchronous mode, the USART connects the MSP430 to an external system via two external pins,

URXD and UTXD. UART mode is selected when the SYNC bit is cleared.

UART mode features include:

• 7- or 8-bit data with odd parity, even parity, or non-parity

• Independent transmit and receive shift registers

• Separate transmit and receive buffer registers

• LSB-first data transmit and receive

• Built-in idle-line and address-bit communication protocols for multiprocessor systems

• Receiver start-edge detection for auto-wake up from LPMx modes

• Programmable baud rate with modulation for fractional baud rate support

• Status flags for error detection and suppression and address detection

• Independent interrupt capability for receive and transmit

Figure 18-1 shows the USART when configured for UART mode.

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SLAU144J–December 2004–Revised July 2013 USART Peripheral Interface, UART Mode

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