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Electrical Characteristics
3.8
External Oscillator (XOSC) Characteristics
Table 9. Oscillator Electrical Specifications (Temperature Range = –40 to 125 ° C Ambient)
Num
C
Rating
Symbol
Min
Typical 1 Max
Unit
Oscillator crystal or resonator (EREFS = 1, ERCLKEN = 1)
1
C
Low range (RANGE = 0)
High range (RANGE = 1) FEE or FBE mode 2
High range (RANGE = 1, HGO = 1) FBELP mode
High range (RANGE = 1, HGO = 0) FBELP mode
f lo
f hi
f hi-hgo
f hi-lp
32
1
1
1
—
—
—
—
38.4
5
16
8
kHz
MHz
MHz
MHz
See crystal or resonator
2
D
Load capacitors
C 1, C 2
manufacturer’s
recommendation.
Feedback resistor
3
D
Low range (32 kHz to 100 kHz)
R F
—
10
—
M Ω
High range (1 MHz to 16 MHz)
—
1
—
Series resistor
Low range, low gain (RANGE = 0, HGO = 0)
Low range, high gain (RANGE = 0, HGO = 1)
—
—
0
100
—
—
4
D
High range, low gain (RANGE = 1, HGO = 0)
High range, high gain (RANGE = 1, HGO = 1)
R S
—
0
—
k Ω
≥ 8 MHz
4 MHz
1 MHz
—
—
—
0
0
0
0
10
20
Crystal start-up time 3
5
C
Low range, low gain (RANGE = 0, HGO = 0)
Low range, high gain (RANGE = 0, HGO = 1)
High range, low gain (RANGE = 1, HGO = 0) 4
High range, high gain (RANGE = 1, HGO = 1) 4
t
CSTL-LP
t
CSTL-HGO
t
CSTH-LP
t
CSTH-HGO
—
—
—
—
200
400
5
20
—
—
—
—
ms
Square wave input clock frequency (EREFS = 0, ERCLKEN = 1)
6
D
FEE or FBE mode 2
f extal
0.03125
—
5
MHz
FBELP mode
0
—
40
1
2
Typical data was characterized at 5.0 V, 25 ° C or is recommended value.
The input clock source must be divided using RDIV to within the range of 31.25 kHz to 39.0625 kHz.
3 This parameter is characterized and not tested on each device. Proper PC board layout procedures must be followed to
achieve specifications.
4 4 MHz crystal.
MCU
EXTAL
R F
XTAL
R S
3.9
C 1
AC Characteristics
Crystal or Resonator
C 2
This section describes AC timing characteristics for each peripheral system.
MC9RS08KA8 Series MCU Data Sheet, Rev. 4
18
Freescale Semiconductor
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