Switching specifications
5.2.2 FTM module timing
Synchronizer circuits determine the shortest input pulses that can be recognized or the
fastest clock that can be used as the optional external source to the timer counter. These
synchronizers operate from the current bus rate clock.
Table 7. FTM input timing
No.
C
Function
Symbol
Min
Max
Unit
1
D
External clock
frequency
fTCLK
0
fBus/4
Hz
2
3
4
5
D
D
D
D
External clock
period
tTCLK
tclkh
4
—
—
—
—
tcyc
tcyc
tcyc
tcyc
External clock
high time
1.5
1.5
1.5
External clock
low time
tclkl
Input capture
pulse width
tICPW
tTCLK
tclkh
TCLK
tclkl
Figure 11. Timer external clock
tICPW
FTMCHn
FTMCHn
tICPW
Figure 12. Timer input capture pulse
KE02 Sub-Family Data Sheet, Rev3, 07/2013.
Freescale Semiconductor, Inc.
17
FREESCALE [ Freescale ]
