56F802 datasheet(23/40 Pages) FREESCALE

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Clock Operation

56F802 Technical Data, Rev. 9

Freescale Semiconductor

Due to the inherent frequency tolerances required for SCI communication, changing the factory-trimmed

oscillator frequency is not recommended. If modification of the Boot Flash contents are required, code

must be included which retrieves the optimum trim value (from address $103F in the Data Flash

Information Block) and writes it to the IOSCTL register. Note that the IFREN bit in the Data Flash control

Figure 3-7 Typical Relaxation Oscillator Frequency vs. Temperature

(Trimmed to 8MHz @ 25oC)

Table 3-8 Relaxation Oscillator Characteristics

Operating Conditions: VSS = VSSA = 0 V, VDD = VDDA = 3.0–3.6 V, TA = –40° to +85°C

Characteristic

Symbol

Min

Typ

Max

Unit

Frequency Accuracy1

1. Over full temperature range.

Δf

—

Frequency Drift over Temp

Δf/Δt

—

+0.1

—

%/oC

Frequency Drift over Supply

Δf/ΔV

—

0.1

—

%/V

8.2

8.0

8.3

8.4

7.9

8.1

7.8

-40

-25

-5

Temperature (oC)

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