adsp-21469 Analog Devices, Inc., adsp-21469 Datasheet - Page 47

• Manufacturer Part Number: adsp-21469
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
Universal Asynchronous Receiver-Transmitter
(UART) Port—Receive and Transmit Timing
Figure 36
The maximum baud rate is PCLK/16 where PCLK = 1/tPCLK.
As shown in
Table 44. UART Port
1
Parameter
Timing Requirement
t
Switching Characteristic
t
UART signals RXD and TXD are routed through DPI P14-1 pins using the SRU.
RXD
TXD
1
1
TRANSMIT
RECEIVE
describes UART port receive and transmit operations.
UART RECEIVE
UART TRANSMIT
DPI_P14
DPI_P14
Figure 36
INTERRUPT
INTERNAL
INTERRUPT
INTERNAL
[RXD]
[TXD]
Incoming Data Pulse Width
Outgoing Data Pulse Width
-
-
1
1
there is some latency between the gener-
START
Figure 36. UART Port—Receive and Transmit Timing
Rev. PrB | Page 47 of 56 | November 2008
tRXD
tTXD
DATA(5
DATA(5
-
-
8)
8)
ation of internal UART interrupts and the external data
operations. These latencies are negligible at the data transmis-
sion rates for the UART.
Min
TBD
TBD
TBD
STOP
STOP(1
-
2)
ADSP-21469/ADSP-21469W
UART TRANSMIT BIT SET BY PROGRAM;
UART RECEIVE BIT SET BY DATA STOP;
CLEARED BY WRITE TO TRANSMIT
CLEARED BY FIFO READ
Max
TBD
TBD
TBD
Unit
ns
ns