Datasheet

MC9S08QB8 Series MCU Data Sheet, Rev. 3
Electrical Characteristics
Freescale Semiconductor16
Figure 10. Typical Crystal or Resonator Circuit: High Range and Low Range/High Gain
Figure 11. Typical Crystal or Resonator Circuit: Low Range/Low Power
3.9 Internal Clock Source (ICS) Characteristics
1
Data in Typical column was characterized at 3.0 V, 25 °C or is typical recommended value.
2
Load capacitors (C
1,
C
2
), feedback resistor (R
F
) and series resistor ( R
S
) are incorporated internally when RANGE = HGO = 0.
3
See crystal or resonator manufacturer’s recommendation.
4
Proper PC board layout procedures must be followed to achieve specifications.
Table 11. ICS Frequency Specifications (Temperature Range = –40 to 85°C Ambient)
Num C Characteristic Symbol Min. Typical
1
Max. Unit
1P
Average internal reference frequency — factory trimmed
at V
DD
= 3.6 V and temperature = 25 °C
f
int_t
— 32.768 — kHz
2P
Internal reference frequency — user trimmed f
int_ut
31.25 — 39.06 kHz
3T
Internal reference start-up time t
IRST
— 60 100 μs
4P
DCO output frequency range —
trimmed
2
Low range (DRS = 00)
f
dco_t
16 —
20
MHz
5P
DCO output frequency
2
Reference = 32768 Hz and DMX32 = 1
f
dco_DMX32
— 19.92 — MHz
6C
Resolution of trimmed DCO output frequency at fixed voltage
and temperature (using FTRIM)
Δf
dco_res_t
— ±0.1 ±0.2
%f
dco
XOSCVLP
EXTAL XTAL
Crystal or Resonator
R
S
C
2
R
F
C
1
XOSCVLP
EXTAL XTAL
Crystal or Resonator