Datasheet
3. C
x
,C
y
can be provided by using the integrated capacitors when the low frequency oscillator (RANGE = 00) is used. For
all other cases external capacitors must be used.
4. When low power mode is selected, R
F
is integrated and must not be attached externally.
5. The EXTAL and XTAL pins should only be connected to required oscillator components and must not be connected to
any other devices.
3.3.2.2 Oscillator frequency specifications
Table 20. Oscillator frequency specifications
Symbol Description Min. Typ. Max. Unit Notes
f
osc_lo
Oscillator crystal or resonator frequency — low-
frequency mode (MCG_C2[RANGE]=00)
32 — 40 kHz
f
osc_hi_1
Oscillator crystal or resonator frequency — high-
frequency mode (low range)
(MCG_C2[RANGE]=01)
3 — 8 MHz
f
osc_hi_2
Oscillator crystal or resonator frequency — high
frequency mode (high range)
(MCG_C2[RANGE]=1x)
8 — 32 MHz
f
ec_extal
Input clock frequency (external clock mode) — — 48 MHz 1, 2
t
dc_extal
Input clock duty cycle (external clock mode) 40 50 60 %
t
cst
Crystal startup time — 32 kHz low-frequency,
low-power mode (HGO=0)
— 750 — ms 3, 4
Crystal startup time — 32 kHz low-frequency,
high-gain mode (HGO=1)
— 250 — ms
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), low-power mode
(HGO=0)
— 0.6 — ms
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), high-gain mode
(HGO=1)
— 1 — ms
1. Other frequency limits may apply when external clock is being used as a reference for the FLL or PLL.
2. When transitioning from FEI or FBI to FBE mode, restrict the frequency of the input clock so that, when it is divided by
FRDIV, it remains within the limits of the DCO input clock frequency.
3. Proper PC board layout procedures must be followed to achieve specifications.
4. Crystal startup time is defined as the time between the oscillator being enabled and the OSCINIT bit in the MCG_S
register being set.
3.4 Memories and memory interfaces
3.4.1 Flash electrical specifications
This section describes the electrical characteristics of the flash memory module.
Peripheral operating requirements and behaviors
24 Kinetis KL24 Sub-Family, Rev4 03/2014.
Freescale Semiconductor, Inc.