Datasheet

ADSP-2191M
–38– REV. A
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.
Figure 23. UART Port—Receive and Transmit Timing
RXD
DATA(5–8)
INTERNAL
UART RECEIVE
INTERRUPT
UA RT RECEIVE BIT SET BY DATA STOP;
CLEARED BY FIFO RE AD
HCLK
(SAMPLE
CLOCK)
TXD
DATA(5–8)
STOP (1–2)
INTERNAL
UART TRAN S M IT
INTERRUPT
UART TRAN SMIT BIT SET BY PROGRAM;
CLEARED B Y WRITE TO TR ANSMIT
START
STOP
TRAN SMIT
RECE IVE
AS DATA
WR ITTEN TO
BUFFER