ADSP-BF531/ADSP-BF532
Universal Asynchronous Receiver-Transmitter
(UART) Port—Receive and Transmit Timing
Figure 24 describes UART port receive and transmit operations.
The maximum baud rate is SCLK/16. As shown in Figure 24
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.
CLKOUT
(SAMPLE CLOCK)
RXD
DATA[8:5]
STOP
RECEIVE
INTERNAL
UART RECEIVE
INTERRUPT
UART RECEIVE BIT SET BY DATA STOP;
CLEARED BY FIFO READ
START
TXD
DATA[8:5]
STOP[2:1]
TRANSMIT
INTERNAL
UART TRANSMIT
INTERRUPT
UART TRANSMIT BIT SET BY PROGRAM;
CLEARED BY WRITE TO TRANSMIT
Figure 24. UART Port—Receive and Transmit Timing
Rev. D
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Page 39 of 60
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August 2006
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