668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 21
668-0011
Manufacturer Part Number
668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0011
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1043
Available stocks
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Manufacturer
Quantity
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Company:
Part Number:
668-0011
Manufacturer:
Rabbit Semiconductor
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2.3.2 Spectrum Spreader
When enabled, the spectrum spreader stretches and compresses the main clock in a complex
pattern that spreads the energy of the clock harmonics over a wider range of frequencies.
There are three settings that correspond to normal and strong spreading in the 0–50 MHz
and >50 MHz main clock range. Each setting will affect the clock cycle differently; the
maximum cycle shortening (at 1.8 V and 25°C) is shown in Table 2-2 below.
Chapter 2 Clocks
0–50 MHz
Normal
Strong
—
> 50 MHz
Normal
Strong
—
Table 2-2. Spectrum Spreader Settings
Figure 2-1. Effects of Spectrum Spreader
GCM0R
0x0040
0x0000
0x0080
Value
Normal spreading of frequencies over
50 MHz
Normal spreading of frequencies up to
50 MHz; strong spreading of
frequencies over 50 MHz
Strong spreading of frequencies up to
50 MHz; normal spreading of
frequencies over 50 MHz
Description
Shortening
Max. Cycle
2.3 ns
4.5 ns
3 ns
11
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