ADSP-BF531 / ADSP-BF532 / ADSP-BF533
Timer Clock Timing
Table 35 and Figure 30 describe timer clock timing.
Table 35. Timer Clock Timing
Parameter
Min
Max
Unit
Switching Characteristic
t TODP
Timer Output Update Delay After PPI_CLK High
12
ns
PPI_CLK
t TODP
TMRx OUTPUT
Figure 30. Timer Clock Timing
Timer Cycle Timing
Table 36 and Figure 31 describe timer expired operations. The
input signal is asynchronous in width capture mode and exter-
nal clock mode and has an absolute maximum input frequency
of f SCLK /2 MHz.
Table 36. Timer Cycle Timing
V DDEXT = 1.8 V
V DDEXT = 2.5 V/3.3 V
Parameter
Min Max
Min Max
Unit
Timing Characteristics
t WL Timer Pulse Width Low 1
t WH Timer Pulse Width High 1
t TIS Timer Input Setup Time Before CLKOUT Low 2
t TIH Timer Input Hold Time After CLKOUT Low 2
1 × t SCLK
1 × t SCLK
8.0
1.5
1 × t SCLK
1 × t SCLK
6.5
1.5
ns
ns
ns
ns
Switching Characteristic s
t HTO Timer Pulse Width Output
t TOD Timer Output Update Delay After CLKOUT High
1 × t SCLK
(2 32 –1) × t SCLK
7.5
1 × t SCLK
(2 32 –1) × t SCLK
6.5
ns
ns
1
2
The minimum pulse widths apply for TMRx input pins in width capture and external clock modes. They also apply to the PF1 or PPI_CLK input pins in PWM output mode.
Either a valid setup and hold time or a valid pulse width is sufficient. There is no need to resynchronize programmable flag inputs.
CLKOUT
t TOD
TMRx OUTPUT
t TIS
t TIH
t HTO
TMRx INPUT
t WH ,t WL
Figure 31. Timer PWM_OUT Cycle Timing
Rev. I
|
Page 41 of 64 |
August 2013
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