Texas Instruments MSP430x1xx - Manual (Page 247)

13-1
USART Peripheral Interface, SPI Mode
USART Peripheral Interface, SPI Mode
The universal synchronous/asynchronous receive/transmit (USART) serial-
communication peripheral supports two serial modes with one hardware
configuration. These modes shift a serial-bit stream in and out of the MSP430
at a programmed rate or at a rate defined by an external clock. The first mode
is the universal asynchronous-receive/transmit (UART) communication
protocol (discussed in Chapter 12); the second is the serial peripheral-
interface (SPI) protocol.
Bit SYNC in control register UCTL selects the required mode:
SYNC = 0: UART—asynchronous mode selected
SYNC = 1: SPI—synchronous mode selected
This chapter describes the SPI mode.
Topic Page
13.1 USART Peripheral Interface 13-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.2 USART Peripheral Interface, SPI Mode 13-3 . . . . . . . . . . . . . . . . . . . . . . . . .
13.3 Synchronous Operation 13-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.4 Interrupt and Control Functions 13-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.5 Control and Status Registers 13-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 13