
Table 15. Oscillator frequency specifications (continued)
Symbol
Description
Min.
Typ.
Max.
Unit
Notes
tcst
Crystal startup time — 32 kHz low-frequency,
low-power mode (HGO=0)
—
TBD
—
ms
Crystal startup time — 32 kHz low-frequency,
high-gain mode (HGO=1)
—
800
—
ms
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), low-power mode
(HGO=0)
—
4
—
ms
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), high-gain mode
(HGO=1)
—
3
—
ms
1. Other frequency limits may apply when external clock is being used as a reference for the FLL or PLL
2. Proper PC board layout procedures must be followed to achieve specifications.
3. Crystal startup time is defined as the time between the oscillator being enabled and the OSCINIT bit in the MCG_S register
being set.
6.3.3 32kHz Oscillator Electrical Characteristics
This section describes the module electrical characteristics.
6.3.3.1 32kHz oscillator DC electrical specifications
Table 16. 32kHz oscillator DC electrical specifications
Symbol
Description
Min.
Typ.
Max.
Unit
VBAT
Supply voltage
1.71
—
3.6
V
RF
Internal feedback resistor
—
100
—
MΩ
Cpara
Parasitical capacitance of EXTAL32 and XTAL32
—
2.5
—
pF
Cload
Internal load capacitance (programmable)
—
15
—
pF
Vpp
Peak-to-peak amplitude of oscillation
—
0.6
—
V
6.3.3.2 32kHz oscillator frequency specifications
Table 17. 32kHz oscillator frequency specifications
Symbol
Description
Min.
Typ.
Max.
Unit
Notes
fosc_lo
Oscillator crystal
—
32
—
kHz
tstart
Crystal start-up time
—
1000
—
ms
1. Proper PC board layout procedures must be followed to achieve specifications.
6.4 Memories and memory interfaces
Peripheral operating requirements and behaviors
K30 Sub-Family Data Sheet Data Sheet, Rev. 4, 3/2011.
Freescale Semiconductor, Inc.
Preliminary
29