MC9S08PT60 Datasheet, PDF (16/37 Pages) Freescale Semiconductor, Inc – MC9S08PT60

Switching specifications



5.2.3 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 t_o 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
f_TCLK
0
f_Bus/4
Hz
frequency
2
D
External clock
t_TCLK
4
—
t_cyc
period
3
D
External clock
t_clkh

1.5

—^
t_cyc
high time
4
D
External clock
t_clkl
1.5
—
t_cyc
low time
5
D
Input capture
t_ICPW
1.5
—
t_cyc
pulse width


t_clkh
t_TCLK
TCLK
t_clkl
Figure 9. Timer external clock
t_ICPW
FTMCHn
FTMCHn
t_ICPW
Figure 10. Timer input capture pulse
MC9S08PT60 Series Data Sheet, Rev. 3, 4/2012.
16
Freescale Semiconductor, Inc.