Texas Instruments MSP430 User Manual

376
* UCSWRST -- Enabled. USCI logic held in reset state
*
* Note: ~<BIT> indicates that <BIT> has value zero
*/
UCA0CTL1 = UCSSEL_2 | UCSWRST;
/*
* Modulation Control Register
*
* UCBRF_0 -- First stage 0
* UCBRS_1 -- Second stage 1
* ~UCOS16 -- Disabled
*
* Note: ~UCOS16 indicates that UCOS16 has value zero
*/
UCA0MCTL = UCBRF_0 | UCBRS_1;
/* Baud rate control register 0 */
UCA0BR0 = 104;
/* Enable USCI */
UCA0CTL1 &= ~UCSWRST;
Right after initialization of all required hardware, the UART starts sending some strings.
UART_puts("\f");
UART_puts("MSP430G2553 UART Demo\n");
UART_puts("Shawon Shahryiar\n");
UART_puts("https://www.facebook.com/MicroArena\n");
The following functions transmit data via UART. The first one can transmit one character at a time
while the second can transmit a string of characters. In both cases, it is checked if the last character
has been successfully sent before sending a new character.
void UART_putc(char ch)
{
while(!(IFG2 & UCA0TXIFG));
UCA0TXBUF = ch;
}
void UART_puts(char *str)
{
while(*str != 0)
{
while(!(IFG2 & UCA0TXIFG));
UCA0TXBUF = *str++;
};
}
Since data recption interrupt is used, data received is extracted from UART reception ISR.
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR_HOOK(void)
{
rx = UCA0RXBUF;
}

Texas Instruments MSP430 Specifications

General

Program Memory Type	Flash
Clock Speed	Up to 25 MHz (depending on the specific device)
Flash Memory	Up to 512 KB (depending on the specific device)
RAM	Up to 66 KB (depending on the specific device)
Operating Voltage	1.8V - 3.6V (depending on the specific device)
ADC	10-bit or 12-bit SAR ADC
Communication Interfaces	UART, SPI, I2C, USB
DMA	Yes (depending on the specific device)
Operating Temperature	-40°C to +85°C
Architecture	16-bit RISC
Low Power Modes	Multiple (LPM0 to LPM4)