MSP430 USART
Afonso Ferreira Miguel
Características - Assíncrono
Operação USART
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In UART mode, the USART transmits and
receives characters at a bit rate
asynchronous to another device. Timing for
each character is based on the selected baud
rate of the USART. The transmit and receive
functions use the same baud rate frequency.
Inicialização
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Set SWRST (BIS.B #SWRST,&UxCTL)
Initialize all USART registers with SWRST = 1
(including UxCTL)
Enable USART module via the MEx SFRs
(URXEx and/or UTXEx)
Clear SWRST via software (BIC.B
#SWRST,&UxCTL)
Enable interrupts (optional) via the IEx SFRs
(URXIEx and/or UTXIEx)
Failure to follow this process may result in
unpredictable USART behavior.
Detecção de erros
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The USART module automatically detects
framing errors, parity errors, overrun errors,
and break conditions when receiving
characters. The bits FE, PE, OE, and BRK
are set when their respective condition is
detected. When any of these error flags are
set, RXERR is also set. The error conditions
are described in Table:
Detecção de erros
UxCTL
UxTCTL
UxRCTL
UxBR0, UxBR1 e UxMCTL
Ver arquivo Excel de configuração de Baud Rate
Byte de recepção
Byte de transmissão
Habilitação da recepção e transmissão da
USART 0
Controle de dados enviados e recebidos
USART - Exemplo
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Configuração
USART - Exemplo
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Recebendo e Transmitindo