NOTE
ALTCLK2~4 are not connected on this chip.
17.6.5 PDB Clock Options
The PDB module is clocked by the system clock (SYS_CLK). The SYS_CLK could run
up to CPU frequency which provides higher timing resolution and more precise delay
control with the PDB counter.
17.6.6 FTM Clocking Information
The following figure shows the input clock sources available for this module.
Peripheral Clocking - FTM
PCC_FLEXTMR
x
[CGC]
PCC module
SCG module
SCG DIVCORE
FTMx module
SYS_CLK
FTM
x
_SC[CLKS]
Peripheral Interface Clock
Registers
SIM_FTMOPT0[FTM
x
CLKSEL]
TCLK0
TCLK1
TCLK2
10
01
11
Counter
SOSC_CLK
SCG_SOSCCSR
[SOSCERCLKEN]
NOTE
Due to FTM hardware implementation limitations, the
frequency of the fixed frequency clock must not exceed 1/2 of
the FTM system clock frequency (SYS_CLK).
NOTE
The external clock are synchronized by FTM system clock
(SYS_CLK). Therefore, to meet Nyquist criteria considering
also jitter, the frequency of the external clock source must not
exceed 1/4 of the system clock frequency.
Module clocks
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
364
NXP Semiconductors
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