MC68HC908LJ12 Datasheet, PDF (397/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Electrical Specifications
23.10 5.0V Oscillator Characteristics
Table 23-8. 5.0V Oscillator Specifications
Characteristic
Internal oscillator clock frequency
Symbol
Min
f_ICLK
46 k
Typ
47 k⁽¹⁾
External reference clock to OSC1⁽²⁾
f_OSC
dc
—
Crystal reference frequency⁽³⁾
f_XCLK
32.768 k
Crystal load capacitance⁽⁴⁾
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor⁽⁵⁾
C_L
—
—
C₁
—
2 × C_L (25p)
C₂
—
2 × C_L (25p)
R_B
—
10 M
R_S
—
100 k
Notes:
1. Typical value reflect average measurements at midpoint of voltage range, 25 °C only.
2. No more than 10% duty cycle deviation from 50%.
3. Fundamental mode crystals only.
4. Consult crystal manufacturer’s data.
5. Not Required for high frequency crystals.
23.11 3.3V Oscillator Characteristics
Table 23-9. 3.3V Oscillator Specifications
Characteristic
Internal oscillator clock frequency
Symbol
f_ICLK
Min
42.8 k
Typ
43.4 k⁽¹⁾
External reference clock to OSC1⁽²⁾
f_OSC
dc
—
Crystal reference frequency⁽³⁾
f_XCLK
32.768 k
Crystal load capacitance⁽⁴⁾
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor⁽⁵⁾
C_L
—
—
C₁
—
2 × C_L (25p)
C₂
—
2 × C_L (25p)
R_B
—
10 M
R_S
—
100 k
Notes:
1. Typical value reflect average measurements at midpoint of voltage range, 25 °C only.
2. No more than 10% duty cycle deviation from 50%.
3. Fundamental mode crystals only.
4. Consult crystal manufacturer’s data.
5. Not Required for high frequency crystals.
Max Unit
48 k
Hz
20 M
Hz
4.9152M Hz
—
—
F
—
F
—
Ω
—
Ω
Max Unit
44 k
Hz
16 M
Hz
4.9152M Hz
—
—
F
—
F
—
Ω
—
Ω
Technical Data
398
Electrical Specifications
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor