mc68hc908ap8a Freescale Semiconductor, Inc, mc68hc908ap8a Datasheet - Page 299

• Manufacturer Part Number: mc68hc908ap8a
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

22.7 5V Oscillator Characteristics
Freescale Semiconductor
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
RC oscillator external R
RC oscillator external C
1. The oscillator circuit operates at V
2. Typical value reflect average measurements at midpoint of voltage range, 25 °C only.
3. No more than 10% duty cycle deviation from 50%. The max. frequency is limited by an EMC filter.
4. Fundamental mode crystals only.
5. Consult crystal vendor data sheet.
8
6
4
2
0
0
(5)
Characteristic
(5)
(5)
(5)
10
(4)
(1)
(3)
Table 22-6. Oscillator Specifications (5V)
REG
MC68HC908AP A-Family Data Sheet, Rev. 3
Resistor, R
.
20
Figure 22-1. RC vs. Frequency
EXT
C
V
30
f
Symbol
XTALCLK
(kΩ)
f
DD
EXT
RCCLK
R
C
f
f
ICLK
OSC
R
R
C
C
C
EXT
EXT
B
S
= 5V, @ 25°C
L
1
2
= 10 pF
40
Min
64k
1M
dc
—
—
—
—
—
—
See
50
Figure 22-1
2 × C
2 × C
88k
Typ
1M
—
—
10
0
(2)
V
L
L
REG
5V Oscillator Characteristics
R
EXT
104k
7.6M
Max
32M
8M
—
—
—
—
—
—
OSC1
MCU
C
EXT
Unit
Hz
Hz
Hz
Hz
pF
Ω
Ω
Ω
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