MC68HC08JL8 Datasheet, PDF (191/212 Pages) Freescale Semiconductor, Inc – Microcontrollers

3V Oscillator Characteristics
17.10 3V Oscillator Characteristics
Table 17-9. Oscillator Specifications (3V)
Characteristic
Internal oscillator clock frequency
Symbol
Min
f_ICLK
Typ
45 k⁽¹⁾
Max
Unit
Hz
External reference clock to OSC1 ⁽²⁾
f_OSC
dc
—
16 M
Hz
Crystal reference frequency ⁽³⁾
Crystal load capacitance ⁽⁴⁾
Crystal fixed capacitance ⁽³⁾
Crystal tuning capacitance ⁽³⁾
Feedback bias resistor
Series resistor ^{(3), (5)}
f_XTALCLK
—
16 M
Hz
C_L
—
—
—
C₁
—
2 × C_L
—
C₂
—
2 × C_L
—
R_B
—
10 MΩ
—
R_S
—
—
—
External RC clock frequency
RC oscillator external R
RC oscillator external C
f_RCCLK
2M
—
10 M
Hz
R_EXT
See Figure 17-4
Ω
C_EXT
—
10
—
pF
1. Typical value reflect average measurements at midpoint of voltage range, 25 °C only. See Figure 17-5 for plot.
2. No more than 10% duty cycle deviation from 50%.
3. Fundamental mode crystals only.
4. Consult crystal vendor data sheet.
5. Not required for high frequency crystals.
14
12
10
8
6
4
2
0
0
C_EXT = 10 pF
3V @ 25°C
MCU
OSC1
V_DD
R_EXT
C_EXT
10
20
30
40
50
Resistor, R_EXT (kΩ)
Figure 17-4. RC vs. Frequency (3V @25°C)
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
Freescale Semiconductor
191