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USART Registers: SPI Mode
15-14 USART Peripheral Interface, SPI Mode
UxCTL, USART Control Register
76543210
Unused Unused I2C
CHAR LISTEN SYNC MM SWRST
rw0 rw0 rw0 rw0 rw0 rw0 rw0 rw1
Unused
Bits
76
Unused
I2C
Bit 5 I2C mode enable. This bit selects I2C or SPI operation when SYNC = 1.
0 SPI mode
1I
2
C mode
CHAR
Bit 4 Character length
0 7-bit data
1 8-bit data
LISTEN
Bit 3 Listen enable. The LISTEN bit selects the loopback mode
0 Disabled
1 Enabled. The transmit signal is internally fed back to the receiver
SYNC
Bit 2 Synchronous mode enable
0 UART mode
1 SPI mode
MM
Bit 1 Master mode
0 USART is slave
1 USART is master
SWRST
Bit 0 Software reset enable
0 Disabled. USART reset released for operation
1 Enabled. USART logic held in reset state
Applies to USART0 on MSP430x15x and MSP430x16x devices only.