TMS320C6745_13 Datasheet, PDF (176/227 Pages) Texas Instruments – TMS320C6745,TMS320C6747 Fixed/Floating-Point Digital Signal Processor

TMS320C6745, TMS320C6747
SPRS377E – SEPTEMBER 2008 – REVISED FEBRUARY 2013
5.23.1 Timer Electrical Data/Timing
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Table 5-86. Timing Requirements for Timer Input^{(1) (2)} (see Figure 5-60)
No.
PARAMETER
MIN
MAX
UNIT
1
t_{c(TM64Px_IN12)}
2
t_w(TINPH)
3
t_w(TINPL)
4
t_{t(TM64Px_IN12)}
Cycle time, TM64Px_IN12
Pulse duration, TM64Px_IN12 high
Pulse duration, TM64Px_IN12 low
Transition time, TM64Px_IN12
4P
0.45C
0.45C
ns
0.55C ns
0.55C ns
0.25P or 10⁽³⁾ ns
(1) P = OSCIN cycle time in ns.
(2) C = TM64P0_IN12 cycle time in ns. For example, when TM64Px_IN12 frequency is 27 MHz, use C = 37.037 ns
(3) Whichever is smaller. P = the period of the applied signal. Maintaining transition times as fast as possible is recommended to improve
noise immunity on input signals.
4
TM64P0_IN12
1
2
3
4
Figure 5-60. Timer Timing
Table 5-87. Switching Characteristics Over Recommended Operating Conditions for Timer Output ⁽¹⁾
No.
PARAMETER
5
t_w(TOUTH)
6
t_w(TOUTL)
Pulse duration, TM64P0_OUT12 high
Pulse duration, TM64P0_OUT12 low
(1) P = OSCIN cycle time in ns. For example, when OSCIN frequency is 27 MHz, use P = 37.037 ns.
MIN
MAX UNIT
4P
ns
4P
ns
TM64P0_OUT12
5
6
Figure 5-61. Timer Timing
176 Peripheral Information and Electrical Specifications
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