Appendix A Electrical Characteristics
MC9S08SG8 MCU Series Data Sheet, Rev. 6
Freescale Semiconductor
299
A.9
Internal Clock Source (ICS) Characteristics
Table A-9. ICS Frequency Specications (Temperature Range = –40 to 125
°C Ambient)
Nu
m
C
Rating
Symbol
Min
Typical
Max
Unit
1P
Internal reference frequency - factory trimmed
at VDD = 5 V
fint_ft
—
31.25
—
kHz
2P Internal reference frequency - untrimmed1
1 TRIM register at default value (0x80) and FTRIM control bit at default value (0x0).
fint_ut
25
36
41.66
kHz
3
P Internal reference frequency - user trimmed
fint_t
31.25
—
39.0625
kHz
4
D Internal reference startup time
tirefst
—
55
100
μs
5—
DCO output frequency range - untrimmed1
value provided for reference: fdco_ut = 1024 × fint_ut
fdco_ut
25.6
36.86
42.66
MHz
6
D DCO output frequency range - trimmed
fdco_t
32
—
40
MHz
7D
Resolution of trimmed DCO output frequency at xed
voltage and temperature (using FTRIM)
Δfdco_res_t
—
± 0.1
± 0.2
%fdco
8D
Resolution of trimmed DCO output frequency at xed
voltage and temperature (not using FTRIM)
Δfdco_res_t
—
± 0.2
± 0.4
%fdco
9P
Total deviation from actual trimmed DCO output
frequency over voltage and temperature
Δfdco_t
—
+ 0.5
– 1.0
± 1.5
%fdco
10
D
Total deviation of trimmed DCO output frequency over
xed voltage and temperature range of 0
°C to 70 °C
Δfdco_t
—
± 0.5
± 1
%fdco
11
D FLL acquisition time 2
2 This specication 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 specication assumes it is already running.
tacquire
1ms
12
D DCO output clock long term jitter (over 2mS interval) 3
3 Jitter is the average deviation from the programmed frequency measured over the specied interval at maximum f
BUS.
Measurements are made with the device powered by ltered supplies and clocked by a stable external clock signal. Noise
injected into the FLL circuitry via VDD and VSS and variation in crystal oscillator frequency increase the CJitter percentage for a
given interval.
CJitter
—
0.02
0.2
%fdco