mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 441

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

24.9 3.3V Control Timing
24.10 5V Oscillator Characteristics
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
Notes:
Notes:
Internal operating frequency
RST input pulse width low
Internal oscillator clock frequency
External reference clock to OSC1
Crystal reference frequency
Crystal load capacitance
Crystal fixed capacitance
Crystal tuning capacitance
Feedback bias resistor
Series resistor
1. V
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
1. Typical value reflect average measurements at midpoint of voltage range, 25 ×C only. See
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.
information.
SS
= 0 Vdc; timing shown with respect to 20% V
(5)
Characteristic
Characteristic
(4)
(3)
(3)
(2)
Table 24-8. 5V Oscillator Specifications
(2)
Table 24-7. 3.3V Control Timing
(1)
Electrical Specifications
DD
and 70% V
Symbol
f
f
f
XCLK
ICLK
OSC
R
R
C
C
C
B
S
L
1
2
DD
, unless otherwise noted.
Symbol
Min
dc
—
—
—
—
—
—
t
f
IRL
OP
2 × C
2 × C
32.768k
Min
1.5
—
50k
100k
20M
Typ
—
—
L
L
(27p)
(33p)
(1)
Figure 24-1
Electrical Specifications
Max
3.3V Control Timing
—
4
4.9152M
for plot.
20M
Max
—
—
—
—
—
Data Sheet
MHz
Unit
µs
Unit
Hz
Hz
Hz
Ω
Ω
F
F
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