mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 379

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

24.11 3.0V Oscillator Characteristics
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
Notes:
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
External RC clock frequency
External resistor
External capacitor
1. No more than 10% duty cycle deviation from 50%.
2. Fundamental mode crystals only.
3. Consult crystal manufacturer’s data.
4. Not Required for high frequency crystals.
2.5
1.5
0.5
3
2
1
0
0
(4)
Characteristic
(3)
Figure 24-2. RC vs. Bus Frequency (3V @25°C)
5
(2)
Table 24-9. 3V Oscillator Specifications
(1)
Resistor R
10
Electrical Specifications
EXT
(kΩ)
Symbol
f
f
RCCLK
R
C
f
f
XCLK
ICLK
OSC
R
R
C
C
C
EXT
EXT
B
S
L
1
2
C
3V @ 25°C
EXT
15
= 10 pF
13.8k
Min
2M
dc
—
—
—
—
—
—
See
20
2 × C
2 × C
32.768k
Figure 24-2
17.2k
100k
10M
Typ
10
—
—
3.0V Oscillator Characteristics
L
—
L
V
DD
(25p)
(25p)
f
RCCLK
Electrical Specifications
R
EXT
= f
4.9152M
OSC1
20.6k
16M
10M
OP
Max
—
—
—
—
—
—
× 4
MCU
C
Data Sheet
EXT
Unit
Hz
Hz
Hz
Hz
pF
Ω
Ω
Ω
F
F
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