Datasheet

MC9S08QE128 Series Data Sheet, Rev. 7
Electrical Characteristics
Freescale Semiconductor26
3.10.2 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.
Figure 19. Timer External Clock
Figure 20. Timer Input Capture Pulse
Table 14. TPM Input Timing
No. C Function Symbol Min Max Unit
1 D External clock frequency f
TCLK
0f
Bus
/4 Hz
2 D External clock period t
TCLK
4—t
cyc
3 D External clock high time t
clkh
1.5 — t
cyc
4 D External clock low time t
clkl
1.5 — t
cyc
5 D Input capture pulse width t
ICPW
1.5 — t
cyc
t
TCLK
t
clkh
t
clkl
TCLK
t
ICPW
TPMCHn
t
ICPW
TPMCHn