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MC68HC908LJ24 Datasheet, PDF (441/464 Pages) Motorola, Inc – Microcontrollers | |||
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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)
fOP
â
4
MHz
RST input pulse width low(3)
tIRL
1.5
â
µs
Notes:
1. VSS = 0 Vdc; timing shown with respect to 20% VDD and 70% VDD, 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
fICLK
Typ
50 k(1)
Max Unit
Hz
External reference clock to OSC1(2)
fOSC
dc
â
20 M
Hz
Crystal reference frequency(3)
fXCLK
â
32.768 k
4.9152M Hz
Crystal load capacitance(4)
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor(5)
CL
â
â
â
C1
â
2 Ã CL (27p)
â
F
C2
â
2 Ã CL (33p)
â
F
RB
â
20 M
â
â¦
RS
â
100 k
â
â¦
Notes:
1. Typical value reflect average measurements at midpoint of voltage range, 25 ÃC 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 manufacturerâs data.
5. Not Required for high frequency crystals.
MC68HC908LJ24/LK24 â Rev. 2.1
Freescale Semiconductor
Electrical Specifications
Data Sheet
441
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