K20P144M120SF3_1210 Datasheet, PDF (32/86 Pages) Freescale Semiconductor, Inc – K20 Sub-Family

Peripheral operating requirements and behaviors
Table 16. Oscillator DC electrical specifications (continued)
Symbol Description
Min.
Typ.
Max.
Unit
R_S
Series resistor — low-frequency, low-power
mode (HGO=0)
—
—
—
kΩ
Series resistor — low-frequency, high-gain mode
—
200
—
kΩ
(HGO=1)
Series resistor — high-frequency, low-power
mode (HGO=0)
—
—
—
kΩ
Series resistor — high-frequency, high-gain
mode (HGO=1)
—
0
—
kΩ
V_pp5 Peak-to-peak amplitude of oscillation (oscillator
—
0.6
—
V
mode) — low-frequency, low-power mode
(HGO=0)
Peak-to-peak amplitude of oscillation (oscillator
—
V_DD
—
V
mode) — low-frequency, high-gain mode
(HGO=1)
Peak-to-peak amplitude of oscillation (oscillator
—
0.6
—
V
mode) — high-frequency, low-power mode
(HGO=0)
Peak-to-peak amplitude of oscillation (oscillator
—
V_DD
—
V
mode) — high-frequency, high-gain mode
(HGO=1)
Notes
1. V_DD=3.3 V, Temperature =25 °C
2. See crystal or resonator manufacturer's recommendation
3. C_x,C_y can be provided by using either the integrated capacitors or by using external components.
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.
6.3.2.2 Oscillator frequency specifications
Table 17. Oscillator frequency specifications
Symbol
f_{osc_lo}
f_{osc_hi_1}
f_{osc_hi_2}
f_{ec_extal}
t_{dc_extal}
Description
Oscillator crystal or resonator frequency — low
frequency mode (MCG_C2[RANGE]=00)
Oscillator crystal or resonator frequency — high
frequency mode (low range)
(MCG_C2[RANGE]=01)
Oscillator crystal or resonator frequency — high
frequency mode (high range)
(MCG_C2[RANGE]=1x)
Input clock frequency (external clock mode)
Input clock duty cycle (external clock mode)
Min.
32
3
8
—
40
Typ.
—
—
—
—
50
Table continues on the next page...
Max.
40
8
32
60
60
Unit
kHz
MHz
MHz
MHz
%
Notes
1
2, 3
K20 Sub-Family Data Sheet, Rev. 4, 10/2012.
32
Freescale Semiconductor, Inc.