MC9RS08KA8_09 Datasheet, PDF (18/42 Pages) Freescale Semiconductor, Inc – MCU Block Diagram

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 Typical¹ Max Unit
Oscillator crystal or resonator (EREFS = 1, ERCLKEN = 1)
1C
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 D Load capacitors
f_lo
f_hi
f_hi-hgo
f_hi-lp
C_1, C₂
32
— 38.4 kHz
1
—
5 MHz
1
—
16 MHz
1
—
8 MHz
See crystal or resonator
manufacturer’s
recommendation.
Feedback resistor
3 D Low range (32 kHz to 100 kHz)
High range (1 MHz to 16 MHz)
R_F
—
10
— MΩ
—
1
—
Series resistor
Low range, low gain (RANGE = 0, HGO = 0)
—
0
Low range, high gain (RANGE = 0, HGO = 1)
—
100
4D
High range, low gain (RANGE = 1, HGO = 0)
High range, high gain (RANGE = 1, HGO = 1)
R_S
—
0
≥ 8 MHz
—
0
4 MHz
—
0
1 MHz
—
0
Crystal start-up time ³
Low range, low gain (RANGE = 0, HGO = 0)
5C
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
—
200
t
CSTL-HGO
—
400
t
CSTH-LP
—
5
t
CSTH-HGO
—
20
Square wave input clock frequency (EREFS = 0, ERCLKEN = 1)
6 D FEE or FBE mode ²
FBELP mode
f_extal
0.03125 —
0
—
—
—
— _kΩ
0
10
20
—
— ms
—
—
5 MHz
40
1 _{Typical data was characterized at 5.0 V, 25 °C or is recommended value.}
2 _{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.}
EXTAL
MCU
XTAL
R_F
R_S
C₁
Crystal or Resonator
C₂
3.9 AC Characteristics
This section describes AC timing characteristics for each peripheral system.
MC9RS08KA8 Series MCU Data Sheet, Rev. 4
18
Freescale Semiconductor