Datasheet

ADSP-21371
Universal Asynchronous Receiver-Transmitter
tion of internal UART interrupts and the external data
(UART) Port—Receive and Transmit Timing
operations. These latencies are negligible at the data transmis-
sion rates for the UART.
Figure 31 describes UART port receive and transmit operations.
The maximum baud rate is PCLK/16 where PCLK = 1/t
PCLK
. As
shown in Figure 31 there is some latency between the genera-
Table 39. UART Port
Parameter Min Max Unit
Timing Requirement
t
RXD
1
Incoming Data Pulse Width ≥95 ns
Switching Characteristic
t
RXD
1
Incoming Data Pulse Width ≥95 ns
1
UART signals RXD and TXD are routed through DPI P14-1 pins using the SRU.
DPI_P14 - 1
[RXD]
DATA(5 - 8)
INTERNAL
UART RECEIVE
INTERRUPT
UART RECEIVE BIT SET BY DATA STOP;
CLEARED BY FIFO READ
STOP
RECEIVE
DPI_P14 - 1
[TXD]
DATA(5 - 8)
STOP(1 - 2)
INTERNAL
UART TRANSMIT
INTERRUPT
UART TRANSMIT BIT SET BY PROGRAM;
CLEARED BY WRITE TO TRANSMIT
START
TRANSMIT
Figure 31. UART Port—Receive and Transmit Timing
Rev. 0 | Page 41 of 48 | June 2007