MC9RS08LA8 Datasheet, PDF (16/34 Pages) Freescale Semiconductor, Inc – MCU Block Diagram

Electrical Characteristics
Table 9. External Oscillator Specifications (Temperature Range = –40 to 85°C Ambient)
Characteristic
Symbol
Min
Typical¹
Max
Unit
Oscillator crystal or resonator (EREFS = 1)
Low range, (IREFS = x)
f_lo
32
High range, FLL bypassed external (CLKS = 10, IREFS = x) f_{hi_byp}
1
High range, FLL engaged external (CLKS = 00, IREFS = 0) f_{hi_eng}
1
Load capacitors
C₁
C₂
Feedback resistor
Low range (32 kHz to 100 kHz)
R_F
High range (1 MHz to 16 MHz)
—
38.4
—
10
—
10
See Note ²
kHz
MHz
MHz
10
MΩ
1
MΩ
Series resistor
Low range
Low Gain (HGO = 0)
High Gain (HGO = 1)
High range
Low Gain (HGO = 0)
High Gain (HGO = 1)
≥ 8 MHz
4 MHz
1 MHz
Crystal start-up time ^{3, 4}
Low range
High range
Square wave input clock frequency (EREFS = 0)
FLL bypass external (CLKS = 10)
FLL engaged external (CLKS = 00)
—
0
—
100
R_S
—
0
—
0
—
10
—
20
t
CSTL
—
500
t
CSTH
—
4
f_extal
0
—
0.03125
—
—
—
—
kΩ
—
—
—
—
—
ms
20
MHz
5
Average internal reference frequency - untrimmed
Average internal reference frequency - trimmed
DCO output frequency range - untrimmed
DCO output frequency range - trimmed
Resolution of trimmed DCO output frequency
at fixed voltage and temperature
f_{int_ut}
f_{int_t}
f_{dco_ut}
f_{dco_t}
Δf_{dco_res_t}
25
31.25
12.8
16
—
31.25
31.25
16
16
—
41.66
39.0625
21.33
20
kHz
kHz
MHz
MHz
±0.2 %f_dco
Total deviation of trimmed DCO output frequency
over voltage and temperature
Δf_{dco_t}
—
—
±2
%f_dco
FLL acquisition time ^3,5
Long term Jitter ⁶ of DCO output clock
(averaged over 2ms interval)
t_acquire
—
C_Jitter
—
—
1
ms
—
0.6
%f_dco
1 _{Data in Typical column was characterized at 3.0 V, 25 °C or is typical recommended value.}
2 _{See crystal or resonator manufacturer’s recommendation.}
3 _{This parameter is characterized and not tested on each device.}
4 _{Proper PC board layout procedures must be followed to achieve specifications.}
5 _{This specification applies to any time the FLL reference source or reference divider is changed, trim value changed or}
changing from FLL disabled (FBELP, FBILP) to FLL enabled (FEI, FEE, FBE, FBI). If a crystal/resonator is being used
as the reference, this specification assumes it is already running.
MC9RS08LA8 Series MCU Data Sheet, Rev. 1
16
Freescale Semiconductor