Datasheet

Electrical Specifications
MC68HC908JL3E Family Data Sheet, Rev. 4
142 Freescale Semiconductor
16.10 3V Oscillator Characteristics
Figure 16-2. RC vs. Frequency (3V @25°C)
Table 16-9. Oscillator Component Specifications (3V)
Characteristic Symbol Min Typ Max Unit
Crystal frequency, XTALCLK
f
OSCXCLK
—8 16 MHz
RC oscillator frequency, RCCLK
f
RCCLK
28 12MHz
External clock reference frequency
(1)
1. No more than 10% duty cycle deviation from 50%.
f
OSCXCLK
dc — 16 MHz
Crystal load capacitance
(2)
2. Consult crystal vendor data sheet.
C
L
—— —
Crystal fixed capacitance
(2)
C
1
—
2 ×
C
L
—
Crystal tuning capacitance
(2)
C
2
—
2 ×
C
L
—
Feedback bias resistor
R
B
— 10 MΩ —
Series resistor
(2), (3)
3. Not required for high frequency crystals.
R
S
—— —
RC oscillator external R
R
EXT
See Figure 16-2
RC oscillator external C
C
EXT
—10 — pF
R
EXT
C
EXT
OSC1
V
DD
MCU
0
0 1020304050
14
12
10
8
6
4
2
RESISTOR, R
EXT
(kΩ)
RC FREQUENCY, f
RCCLK
(MHz)
C
EXT
= 10 pF
3V @ 25 °C