Datasheet

Electrical Characteristics
MC9S08QE8 Series Data Sheet, Rev. 8
Freescale Semiconductor 17
3.8 External Oscillator (XOSCVLP) Characteristics
Refer to Figure 12 and Figure 13 for crystal or resonator circuits.
Table 10. XOSCVLP Specifications (Temperature Range = –40 to 85C Ambient)
Num C Characteristic Symbol Min. Typical
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), FBELP mode
High range (RANGE = 1), low power (HGO = 0), FBELP mode
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
—
—
—
M
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
—
—
—
—
—
—
—
100
0
0
0
0
—
—
—
0
10
20
k
5C
Crystal start-up time
4
Low range, low power
Low range, high gain
High range, low power
High range, high gain
4
Proper PC board layout procedures must be followed to achieve specifications.
t
CSTL
t
CSTH
—
—
—
—
600
400
5
15
—
—
—
—
ms
6D
Square wave input clock frequency (EREFS = 0, ERCLKEN = 1)
FEE mode
FBE or FBELP mode
f
extal
0.03125
0
—
—
20
20
MHz
MHz