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USART Introduction: SPI Mode
14.1 USART Introduction: SPI Mode
In synchronous mode, the USART connects the MSP430 to an external
system via three or four pins: SIMO, SOMI, UCLK, and STE. SPI mode is
selected when the SYNC bit is set and the I2C bit is cleared.
SPI mode features include:
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Figure 14−1 shows the USART when configured for SPI mode.
14-2
USART Peripheral Interface, SPI Mode
7- or 8-bit data length
3-pin and 4-pin SPI operation
Master or slave modes
Independent transmit and receive shift registers
Separate transmit and receive buffer registers
Selectable UCLK polarity and phase control
Programmable UCLK frequency in master mode
Independent interrupt capability for receive and transmit
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