Datasheet

www.ti.com USCI Operation: UART Mode
Example 15-2 shows an extract of an interrupt service routine to handle data transmit interrupts from
USCI_A0 in either UART or SPI mode and USCI_B0 in SPI mode.
Example 15-2. Shared Interrupt Vectors Software Example, Data Transmit
USCIA0_TX_USCIB0_TX_ISR
BIT.B #UCA0TXIFG, &IFG2 ; USCI_A0 Transmit Interrupt?
JNZ USCIA0_TX_ISR
USCIB0_TX_ISR
; Write UCB0TXBUF (clears UCB0TXIFG)
...
RETI
USCIA0_TX_ISR
; Write UCA0TXBUF (clears UCA0TXIFG)
...
RETI
427
SLAU144J–December 2004–Revised July 2013 Universal Serial Communication Interface, UART Mode
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