K10P144M120SF3 Datasheet, PDF (30/75 Pages) Freescale Semiconductor, Inc – K10 Sub-Family Data Sheet

Peripheral operating requirements and behaviors
Table 16. Oscillator frequency specifications (continued)
Symbol
t_cst
Description
Crystal startup time — 32 kHz low-frequency,
low-power mode (HGO=0)
Crystal startup time — 32 kHz low-frequency,
high-gain mode (HGO=1)
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), low-power mode
(HGO=0)
Crystal startup time — 8 MHz high-frequency
(MCG_C2[RANGE]=01), high-gain mode
(HGO=1)
Min.
—
—
—
Typ.
1000
500
0.6
Max.
—
—
—
Unit
Notes
ms
4, 5
ms
ms
—
1
—
ms
1. Frequencies less than 8 MHz are not in the PLL range.
2. Other frequency limits may apply when external clock is being used as a reference for the FLL or PLL.
3. When transitioning from FBE to FEI 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.
4. Proper PC board layout procedures must be followed to achieve specifications.
5. 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 17. 32kHz oscillator DC electrical specifications
Symbol
V_BAT
R_F
C_para
V_pp1
Description
Supply voltage
Internal feedback resistor
Parasitical capacitance of EXTAL32 and XTAL32
Peak-to-peak amplitude of oscillation
Min.
1.71
—
—
—
Typ.
—
100
5
0.6
Max.
Unit
3.6
V
—
MΩ
7
pF
—
V
1. The EXTAL32 and XTAL32 pins should only be connected to required oscillator components and must not be connected to
any other devices.
6.3.3.2 32kHz oscillator frequency specifications
Table 18. 32kHz oscillator frequency specifications
Symbol
f_{osc_lo}
t_start
Description
Oscillator crystal
Crystal start-up time
Min.
Typ.
Max.
Unit
—
32.768
—
kHz
—
1000
—
ms
1. Proper PC board layout procedures must be followed to achieve specifications.
Notes
1
K10 Sub-Family Data Sheet Data Sheet, Rev. 3, 2/2012.
30
Preliminary
Freescale Semiconductor, Inc.