K40P81M100SF2_11 Datasheet, PDF (27/63 Pages) Freescale Semiconductor, Inc – Up to 100 MHz ARM Cortex-M4 core with DSP instructions delivering 1.25 Dhrystone MIPS per MHz

Peripheral operating requirements and behaviors
Table 14. Oscillator DC electrical specifications (continued)
Symbol
R_S
Description
Series resistor — low-frequency, low-power
mode (HGO=0)
Series resistor — low-frequency, high-gain mode
(HGO=1)
Series resistor — high-frequency, low-power
mode (HGO=0)
Series resistor — high-frequency, high-gain
mode (HGO=1)
Min.
—
—
—
Typ.
—
200
—
Max.
—
—
—
Unit
Notes
kΩ
kΩ
kΩ
—
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)
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 15. 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
Max.
40
8
32
50
60
Table continues on the next page...
Unit
kHz
MHz
MHz
MHz
%
Notes
1
K40 Sub-Family Data Sheet Data Sheet, Rev. 4, 3/2011.
Freescale Semiconductor, Inc.
Preliminary
27