Description: SPI master talks to SPI slave using 3-wire mode. Incrementing
data is sent by the master starting at 0x01. Received data is expected to
be same as the previous transmission TXData = RXData-1.
USCI RX ISR is used to handle communication with the CPU, normally in LPM0.
ACLK = ~32.768kHz, MCLK = SMCLK = DCO ~ 1MHz. BRCLK = ACLK/2.
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SPI_of_MSP430F249.c
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