DSP56F802 View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
MFG CO.
'DSP56F802' PDF : 40 Pages View PDF
Clock Operation
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
register must be set in order to read the Data Flash Information Block.
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
Frequency Accuracy1
Frequency Drift over Temp
Δf
—
+2
+5
Δf/Δt
—
+0.1
—
Frequency Drift over Supply
1. Over full temperature range.
Δf/ΔV
—
0.1
—
Unit
%
%/oC
%/V
8.4
8.3
8.2
8.1
8.0
7.9
7.8
-40
-25
-5
15
35
55
75
85
Temperature (oC)
Figure 3-7 Typical Relaxation Oscillator Frequency vs. Temperature
(Trimmed to 8MHz @ 25oC)
56F802 Technical Data, Rev. 9
Freescale Semiconductor
23
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