MC9RS08LE4 Datasheet, PDF (18/30 Pages) Freescale Semiconductor, Inc – MCU Block Diagram

AC Characteristics
2 _{This is the minimum pulse width that is guaranteed to pass through the pin synchronization circuitry. Shorter pulses may}
or may not be recognized. In stop mode, the synchronizer is bypassed so shorter pulses can be recognized in that case.
3 _{Timing is shown with respect to 20% VDD and 80% VDD levels. Temperature range –40 °C to 85 °C.}
RESET
t_extrst
Figure 13. Reset Timing
KBI Pin
(rising or high level)
t_KBIPWS
t_KBIPW
KBI Pin
(falling or low level)
t_KBIPW
t_KBIPWS
Figure 14. KBI Pulse Width
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.
Table 12. TPM/MTIM Input Timing
Num C
Function
Symbol
Min
1
D
External clock frequency
f_TCLK
0
2
D
External clock period
t_TCLK
4
3
D
External clock high time
t_clkh
1.5
4
D
External clock low time
t_clkl
1.5
5
D
Input capture pulse width
f_ICPW
1.5
Max
f_Bus1/4
—
—
—
—
Unit
MHz
t_CYC
t_CYC
t_CYC
t_CYC
t_clkh
t_TCLK
TCLK
t_clkl
Figure 15. Timer External Clock
MC9RS08LE4 MCU Data Sheet, Rev. 2
18
Freescale Semiconductor