MC9S08QG8_09 Datasheet, PDF (277/314 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Appendix A Electrical Characteristics
Table A-8. XOSC and ICS Specifications (Temperature Range = –40 to 125°C Ambient)
Characteristic
Symbol
Min
Typ
Max
Unit
Resolution of trimmed DCO output frequency at fixed voltage and
temperature ⁴
Δf_{dco_res_t}
—
±0.1
± 0.2
%f_dco
Total deviation of DCO output from trimmed frequency:³
At 8MHz over full voltage and temperature range (M Suffix)
—
–1.5 to ±0.5
±3
At 8MHz over full voltage and temperature rang (C Suffix)
Δf_{dco_t}
—
–1.0 to ±0.5 ± 2
%f_dco
At 8MHz and 3.6V from 0 to 70°C
(C Suffix)
—
±0.5
±1
FLL acquisition time ^4,6
t_Acquire
1.5
ms
Long term jitter of DCO output clock (averaged over 2-ms interval) ^{7 C}Jitter
—
0.02
0.2
%f_dco
1 _{When ICS is configured for FEE or FBE mode, input clock source must be divisible using RDIV to within the range of 31.25 kHz}
to 39.0625 kHz.
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 _{TRIM register at default value (0x80) and FTRIM control bit at default value (0x0).}
6 _{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.
7 _{Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum fBus.}
Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal. Noise
injected into the FLL circuitry via V_DD and V_SS and variation in crystal oscillator frequency increase the C_Jitter percentage for a
given interval.
EXTAL
XOSC
R_F
XTAL
R_S
Crystal or Resonator
C₁
C₂
Figure A-7. Typical Crystal or Resonator Circuit
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5
Freescale Semiconductor
275