MC908JL3ECPE Datasheet, PDF (142/180 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Specifications
16.10 3V Oscillator Characteristics
Table 16-9. Oscillator Component Specifications (3V)
Characteristic
Crystal frequency, XTALCLK
RC oscillator frequency, RCCLK
External clock reference frequency⁽¹⁾
Crystal load capacitance⁽²⁾
Crystal fixed capacitance⁽²⁾
Crystal tuning capacitance⁽²⁾
Feedback bias resistor
Series resistor^{(2), (3)}
RC oscillator external R
RC oscillator external C
1. No more than 10% duty cycle deviation from 50%.
2. Consult crystal vendor data sheet.
3. Not required for high frequency crystals.
Symbol
f_OSCXCLK
f_RCCLK
f_OSCXCLK
C_L
C₁
C₂
R_B
R_S
R_EXT
C_EXT
Min
Typ
Max
—
8
16
2
8
12
dc
—
16
—
—
—
—
2 × C_L
—
—
2 × C_L
—
—
10 MΩ
—
—
—
—
See Figure 16-2
—
10
—
Unit
MHz
MHz
MHz
pF
14
12
10
C_EXT = 10 pF
MCU
3V @ 25°C
8
OSC1
6
V_DD
4
R_EXT
C_EXT
2
0
0
10
20
30
40
50
RESISTOR, R_EXT (kΩ)
Figure 16-2. RC vs. Frequency (3V @25°C)
MC68HC908JL3E Family Data Sheet, Rev. 4
142
Freescale Semiconductor