Datasheet

MC9RS08KB12 Series MCU Data Sheet, Rev. 5
Electrical Characteristics
Freescale Semiconductor26
3.8 External Oscillator (XOSC) Characteristics
3.9 AC Characteristics
This section describes AC timing characteristics for each peripheral system.
Table 9. Oscillator Electrical Specifications (Temperature Range = –40 to 85°C Ambient)
Num C Rating Symbol Min Typical
1
1
Typical data was characterized at 5.0 V, 25 °C or is recommended value.
Max Unit
1C
Oscillator crystal or resonator (EREFS = 1, ERCLKEN = 1)
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
2
The input clock source must be divided using RDIV to within the range of 31.25 kHz to 39.0625 kHz.
f
lo
f
hi
f
hi-hgo
f
hi-lp
32
1
1
1
—
—
—
—
38.4
5
16
8
kHz
MHz
MHz
MHz
2 D Load capacitors C
1,
C
2
See crystal or resonator
manufacturer’s
recommendation.
3D
Feedback resistor
Low range (32 kHz to 100 kHz)
High range (1 MHz to 16 MHz)
R
F
—
—
10
1
—
—
MΩ
4D
Series resistor
Low range, low gain (RANGE = 0, HGO = 0)
Low range, high gain (RANGE = 0, HGO = 1)
High range, low gain (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
—
—
—
0
10
20
kΩ
5C
Crystal start-up time
3
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
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.
t
CSTL-LP
t
CSTL-HGO
t
CSTH-LP
t
CSTH-HGO
—
—
—
—
200
400
5
20
—
—
—
—
ms
6D
Square wave input clock frequency (EREFS = 0, ERCLKEN = 1)
FEE or FBE mode
2
FBELP mode
f
extal
0.03125
0
—
—
5
40
MHz
MCU
EXTAL XTAL
Crystal or Resonator
R
S
C
2
R
F
C
1