MC68HC908LJ24 Datasheet, PDF (441/464 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Electrical Specifications
3.3V Control Timing
24.9 3.3V Control Timing
Table 24-7. 3.3V Control Timing
Characteristic⁽¹⁾
Symbol
Min
Max
Unit
Internal operating frequency⁽²⁾
f_OP
—
4
MHz
RST input pulse width low⁽³⁾
t_IRL
1.5
—
µs
Notes:
1. V_SS = 0 Vdc; timing shown with respect to 20% V_DD and 70% V_DD, unless otherwise noted.
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this
information.
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
24.10 5V Oscillator Characteristics
Table 24-8. 5V Oscillator Specifications
Characteristic
Internal oscillator clock frequency
Symbol
Min
f_ICLK
Typ
50 k⁽¹⁾
Max Unit
Hz
External reference clock to OSC1⁽²⁾
f_OSC
dc
—
20 M
Hz
Crystal reference frequency⁽³⁾
f_XCLK
—
32.768 k
4.9152M Hz
Crystal load capacitance⁽⁴⁾
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor⁽⁵⁾
C_L
—
—
—
C₁
—
2 × C_L (27p)
—
F
C₂
—
2 × C_L (33p)
—
F
R_B
—
20 M
—
Ω
R_S
—
100 k
—
Ω
Notes:
1. Typical value reflect average measurements at midpoint of voltage range, 25 ×C only. See Figure 24-1 for plot.
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.
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
Electrical Specifications
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Data Sheet
441