mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 378
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mc68hc908sr12
Manufacturer Part Number
mc68hc908sr12
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908SR12.pdf
(404 pages)
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Electrical Specifications
24.10 5.0V Oscillator Characteristics
Data Sheet
378
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.
5
4
3
2
1
0
0
(4)
Characteristic
2
(3)
Figure 24-1. RC vs. Bus Frequency (5V @25°C)
(2)
Table 24-8. 5V Oscillator Specifications
(1)
Resistor R
4
Electrical Specifications
EXT
(kΩ)
6
Symbol
f
RCCLK
f
R
C
f
f
XCLK
ICLK
OSC
R
R
C
C
C
EXT
EXT
L
1
2
B
S
C
5V @ 25°C
EXT
= 10 pF
8
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
19.2k
Min
2M
dc
—
—
—
—
—
—
See
10
2 × C
2 × C
32.768k
Figure 24-1
100k
10M
Typ
24k
10
V
—
—
—
L
L
DD
(25p)
(25p)
f
RCCLK
Freescale Semiconductor
R
EXT
= f
OSC1
4.9152M
28.8k
OP
20M
18M
Max
—
—
—
—
—
—
× 4
MCU
C
EXT
Unit
Hz
Hz
Hz
Hz
pF
Ω
Ω
Ω
F
F
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