ADSP-21371KSWZ-2A2 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'ADSP-21371KSWZ-2A2' PDF : 52 Pages View PDF
ADSP-21371/ADSP-21375
Universal Asynchronous Receiver-Transmitter
(UART) Port—Receive and Transmit Timing
Figure 32 describes UART port receive and transmit operations.
The maximum baud rate is PCLK/16 where PCLK = 1/tPCLK. As
shown in Figure 32 there is some latency between the
Table 39. UART Port
Parameter
Timing Requirement
tTXD1
Incoming Data Pulse Width
Switching Characteristic
tRXD1
Incoming Data Pulse Width
1 UART signals TXD and RXD are routed through DPI P14-1 pins using the SRU.
generation of internal UART interrupts and the external data
operations. These latencies are negligible at the data transmis-
sion rates for the UART.
Min
16tPCLK–1
16tPCLK–1
Max
Unit
ns
ns
DPI_P14–1
[RxD]
RECEIVE
INTERNAL
UART RECEIVE
INTERRUPT
DPI_P14–1
[TxD]
TRANSMIT
INTERNAL
UART TRANSMIT
INTERRUPT
START
DATA (5–8)
tRXD
DATA (5–8)
tTXD
STOP
UART RECEIVE BIT SET BY DATA STOP;
CLEARED BY FIFO READ
STOP (1–2)
UART TRANSMIT BIT SET BY PROGRAM;
CLEARED BY WRITE TO TRANSMIT
Figure 32. UART Port—Receive and Transmit Timing
Rev. C | Page 42 of 52 | September 2009
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