Datasheet

Electrical Characteristics
MC9S08QE128 Series Data Sheet, Rev. 7
Freescale Semiconductor 21
3.8 External Oscillator (XOSC) Characteristics
Reference Figure 13 and Figure 14 for crystal or resonator circuits.
Table 11. XOSC and ICS Specifications (Temperature Range = –40 to 85°C Ambient)
Num C Characteristic Symbol Min Typ
1
1
Data in Typical column was characterized at 3.0 V, 25°C or is typical recommended value.
Max Unit
1C
Oscillator crystal or resonator (EREFS = 1, ERCLKEN = 1)
Low range (RANGE = 0)
High range (RANGE = 1), high gain (HGO = 1)
High range (RANGE = 1), low power (HGO = 0)
f
lo
f
hi
f
hi
32
1
1
—
—
—
38.4
16
8
kHz
MHz
MHz
2D
Load capacitors
Low range (RANGE=0), low power (HGO=0)
Other oscillator settings
C
1,
C
2
See Note
2
See Note
3
2
Load capacitors (C
1
,C
2
), feedback resistor (R
F
) and series resistor (R
S
) are incorporated internally when RANGE=HGO=0.
3
See crystal or resonator manufacturer’s recommendation.
3D
Feedback resistor
Low range, low power (RANGE=0, HGO=0)
2
Low range, High Gain (RANGE=0, HGO=1)
High range (RANGE=1, HGO=X)
R
F
—
—
—
—
10
1
—
—
—
MΩ
4D
Series resistor —
Low range, low power (RANGE = 0, HGO = 0)
2
Low range, high gain (RANGE = 0, HGO = 1)
High range, low power (RANGE = 1, HGO = 0)
High range, high gain (RANGE = 1, HGO = 1)
≥ 8 MHz
4 MHz
1 MHz
R
S
—
—
—
—
—
—
—
0
100
0
0
0
—
—
—
0
10
20
kΩ
5C
Crystal start-up time
4
Low range, low power
Low range, high power
High range, low power
High range, high power
4
Proper PC board layout procedures must be followed to achieve specifications.
t
CSTL
t
CSTH
—
—
—
—
200
400
5
15
—
—
—
—
ms
6D
Square wave input clock frequency (EREFS = 0, ERCLKEN = 1)
FEE or FBE mode
FBELP mode
f
extal
0.03125
0
—
—
40.0
50.33
MHz
MHz