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USART Registers: SPI Mode
14-14
USART Peripheral Interface, SPI Mode
UxCTL, USART Control Register
76543210
Unused Unused I2C
†
CHAR LISTEN SYNC MM SWRST
rw−0 rw−0 rw−0 rw−0 rw−0 rw−0 rw−0 rw−1
Unused
Bits
7−6
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.