adsp-21371kswz-2a Analog Devices, Inc., adsp-21371kswz-2a Datasheet - Page 43

• Manufacturer Part Number: adsp-21371kswz-2a
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

Universal Asynchronous Receiver-Transmitter
(UART) Port—Receive and Transmit Timing
Figure 31
The maximum baud rate is PCLK/16 where PCLK = 1/t
shown in
Table 41. UART Port
1
Parameter
Timing Requirement
t
Switching Characteristic
t
UART signals TXD and RXD are routed through DPI P14-1 pins using the SRU.
TXD
RXD
1
1
TRANSMIT
RECEIVE
Figure 31
describes UART port receive and transmit operations.
UART RECEIVE
UART TRANSMIT
DPI_P14
DPI_P14
INTERRUPT
INTERNAL
INTERRUPT
INTERNAL
[RXD]
[TXD]
Incoming Data Pulse Width
Incoming Data Pulse Width
-
-
there is some latency between the genera-
1
1
START
t RXD
t TXD
Figure 31. UART Port—Receive and Transmit Timing
Rev. B | Page 43 of 52 | June 2008
PCLK
. As
DATA(5
DATA(5
-
-
8)
8)
tion of internal UART interrupts and the external data
operations. These latencies are negligible at the data transmis-
sion rates for the UART.
Min
16t
16t
STOP
STOP(1
PCLK
PCLK
–1
–1
-
2)
UART TRANSMIT BIT SET BY PROGRAM;
UART RECEIVE BIT SET BY DATA STOP;
CLEARED BY WRITE TO TRANSMIT
ADSP-21371/ADSP-21375
CLEARED BY FIFO READ
Max
Unit
ns
ns