MC9S08QE8 Datasheet, PDF (18/46 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit

Electrical Characteristics
Table 10. ICS Frequency Specifications (Temperature Range = –40 to 85°C Ambient) (continued)
Num C
Characteristic
Symbol Min. Typical¹ Max. Unit
8
C
Total deviation of trimmed DCO output frequency over voltage
and temperature
9
C
Total deviation of trimmed DCO output frequency over fixed
voltage and temperature range of 0°C to 70 °C
Δf_{dco_t}
Δf_{dco_t}
—
+ 0.5
-1.0
± 2 %f_dco
—
± 0.5
± 1 %f_dco
10 C _{FLL acquisition time}³
t_Acquire
—
—
1
ms
Long term jitter of DCO output clock (averaged over 2-ms
11 C _interval)4
C_Jitter
—
0.02
0.2 %f_dco
1 _{Data in Typical column was characterized at 3.0 V, 25°C or is typical recommended value.}
2 _{The resulting bus clock frequency should not exceed the maximum specified bus clock frequency of the device.}
3 _{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.
4 _{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.
1.00%
0.50%
0.00%
-60
-40
-20
0
-0.50%
-1.00%
20
40
60
TBD
80
100
120
-1.50%
-2.00%
Temperature
Figure 13. Deviation of DCO Output from Trimmed Frequency (20 MHz, 3.0 V)
3.10 AC Characteristics
This section describes timing characteristics for each peripheral system.
MC9S08QE8 Series, Rev. 3
18
Preliminary
Freescale Semiconductor
Subject to Change Without Notice