Datasheet

Rev. D | Page 61 of 88 | July 2013
ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
Universal Asynchronous Receiver-Transmitter
(UART) Ports—Receive and Transmit Timing
For information on the UART port receive and transmit opera-
tions, see the ADSP-BF52x Hardware Reference Manual.
General-Purpose Port Timing
Table 51 and Figure 30 describe general-purpose
port operations.
Table 51. General-Purpose Port Timing for ADSP-BF522/ADSP-BF524/ADSP-BF526 Processors
Parameter
V
DDEXT
1.8V Nominal
V
DDEXT
2.5 V or 3.3V Nominal
Min Max Min Max Unit
Timing Requirement
t
WFI
General-Purpose Port Ball Input Pulse Width t
SCLK
+ 1 t
SCLK
+ 1 ns
Switching Characteristic
t
GPOD
General-Purpose Port Ball Output Delay from CLKOUT
Low
0 11.0 0 8.2 ns
Table 52. General-Purpose Port Timing for ADSP-BF523/ADSP-BF525/ADSP-BF527 Processors
Parameter
V
DDEXT
1.8V Nominal
V
DDEXT
2.5 V or 3.3V Nominal
Min Max Min Max Unit
Timing Requirement
t
WFI
General-Purpose Port Ball Input Pulse Width t
SCLK
+ 1 t
SCLK
+ 1 ns
Switching Characteristic
t
GPOD
General-Purpose Port Ball Output Delay from CLKOUT Low 0 8.2 0 6.5 ns
Figure 30. General-Purpose Port Timing
CLKOUT
GPIO OUTPUT
GPIO INPUT
t
WFI
t
GPOD