MC68HLC908QY4 Datasheet, PDF (156/182 Pages) Motorola, Inc – Microcontrollers

Electrical Specifications
16.8 Oscillator Characteristics
Characteristic
Symbol
Internal oscillator frequency⁽¹⁾
f_INTCLK
Crystal frequency, XTALCLK⁽¹⁾
f_OSCXCLK
External RC oscillator frequency, RCCLK⁽¹⁾
f_RCCLK
External clock reference frequency^{(1), (2)}
f_OSCXCLK
Crystal load capacitance⁽³⁾
C_L
Crystal fixed capacitance⁽³⁾
C₁
Crystal tuning capacitance⁽³⁾
C₂
Feedback bias resistor
R_B
Series resistor
R_S
RC oscillator external resistor
R_EXT
1. Bus frequency, f_OP, is oscillator frequency divided by 4.
2. No more than 10% duty cycle deviation from 50%.
3. Consult crystal vendor data sheet.
Min
Typ
Max
—
4.0
—
30
32.768
100
2
—
8
dc
—
8
—
12.5
—
—
2 x C_L
—
—
2 x C_L
—
1
10
22
100
330
470
See Figure 16-4
Unit
MHz
kHz
MHz
MHz
pF
—
—
MΩ
kΩ
—
12
10
8
3V
6
2.3V
4
2
0
0
10
20
30
40
50
60
R_EXT (KΩ)
MCU
OSC1
V_DD
R_EXT
Figure 16-4. Typical RC Oscillator Frequency versus R_EXT (25°C)
MC68HLC908QY/QT Family Data Sheet, Rev. 3
156
Freescale Semiconductor