dsp56f802ta80 Freescale Semiconductor, Inc, dsp56f802ta80 Datasheet - Page 23

• Manufacturer Part Number: dsp56f802ta80
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

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.
Freescale Semiconductor
Frequency Accuracy
Frequency Drift over Temp
Frequency Drift over Supply
1. Over full temperature range.
Figure 3-7 Typical Relaxation Oscillator Frequency vs. Temperature
Operating Conditions:
Characteristic
8.4
8.3
8.2
8.0
7.9
7.8
8.1
1
Table 3-8 Relaxation Oscillator Characteristics
-40
-25
(Trimmed to 8MHz @ 25
V
56F802 Technical Data, Rev. 9
SS
= V
-5
Symbol
Temperature (
Δf/ΔV
SSA
Δf/Δt
Δf
= 0 V, V
15
DD
o
C)
= V
Min
35
—
—
—
DDA
= 3.0–3.6 V, T
o
55
C)
+0.1
Typ
0.1
+2
75
A
= –40° to +85°C
85
Max
+5
—
—
Clock Operation
%/
Unit
%/V
%
o
C
23