ADSP-2191M

Universal Asynchronous Receiver-Transmitter (UART) Port—Receive and Transmit Timing

Figure 23 describes UART port receive and transmit operations. The maximum baud rate is HCLK/16. As shown in Figure 23 there is some latency between the generation internal UART interrupts and the external data operations. These latencies are negligible at the data transmission rates for the UART.

HCLK (SAMPLE CLOCK)

RECEIVE

INTERNAL

UART RECEIVE

INTERRUPT

AS DATA

TRANSMIT WRITTEN TO

BUFFER

INTERNAL

UART TRANSMIT

INTERRUPT

STOP

UART RECEIVE BIT SET BY DATA STOP;

CLEARED BY FIFO READ

STOP (1–2)

UART TRANSMIT BIT SET BY PROGRAM;

CLEARED BY WRITE TO TRANSMIT