ADSP-BF542/ADSP-BF544/ADSP-BF547/ADSP-BF548/ADSP-BF549
Universal Asynchronous Receiver-Transmitter
(UART) Ports—Receive and Transmit Timing
The UART ports have a maximum baud rate of SCLK/16. There
is some latency between the generation of internal UART inter-
rupts and the external data operations. These latencies are
negligible at the data transmission rates for the UART. For more
information, see the ADSP-BF54x Blackfin Processor Hardware
Reference.
General-Purpose Port Timing
Table 47 and Figure 40 describe general-purpose
port operations.
Table 47. General-Purpose Port Timing
Parameter
Timing Requirement
tWFI
Min
Max
Unit
ns
General-Purpose Port Pin Input Pulse Width
tSCLK + 1
–0.3
Switching Characteristics
tGPOD General-Purpose Port Pin Output Delay from CLKOUT Low
6
ns
CLKOUT
GPIO OUTPUT
GPIO INPUT
tGPOD
tWFI
Figure 40. General-Purpose Port Timing
Rev. C
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Page 66 of 100
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February 2010
ADI [ ADI ]
