MC9S08SF4 Datasheet, PDF (19/32 Pages) Freescale Semiconductor, Inc – Technical Data

AC Characteristics
3.9.2 Timer/PWM (TPM) 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 10. TPM/MTIM Input Timing
Function
Symbol
Min
External clock frequency
f_TCLK
dc
External clock period
t_TCLK
4
External clock high time
t_clkh
1.5
External clock low time
t_clkl
1.5
Input capture pulse width for TPM
t_ICPW
1.5
Timer clock frequency
f_timer
—
Max
f_timer/4
—
—
—
—
40
Unit
MHz
t_cyc
t_cyc
t_cyc
t_cyc
MHz
t_clkh
t_Text
TCLK
t_clkl
Figure 16. Timer External Clock
TPMCHn
t_ICPW
TPMCHn
t_ICPW
Figure 17. Timer Input Capture Pulse
MC9S08SF4 Series MCU Data Sheet, Rev. 2
Freescale Semiconductor
19