NOTE
ALTCLK2~4 are not connected on this chip.
18.6.5 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.
18.6.6 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
DIV1
SOSC
PLL
FIRC
SIRC
PLLDIV1_CLK
SOSCDIV1_CLK
SIRCDIV1_CLK
FIRCDIV1_CLK
PCC_FLEXTMR
x
[PCS]:
see PCC chapter for
detailed setting
DIV1
DIV1
DIV1
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.
Chapter 18 Clock Distribution
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
443
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