20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 22
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 20-668-0011
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
Data Bus Width
8 bit
Maximum Clock Frequency
55.5 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Number Of Programmable I/os
56
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
316-1061
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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The spectrum spreader either stretches or shrinks the low plateau of the clock by a maxi-
mum of 3 ns for the normal spreading and up to 5 ns for the strong spreading. If the clock
doubler is used, this will cause an additional asymmetry between alternate clock cycles.
Both normal and strong modes reduce clock harmonics by approximately 15 dB for fre-
quencies above 100 MHz; for lower frequencies the strong setting has a greater effect in
reducing the peak spectral strength as shown in Figure 2-2.
Two registers control the clock spectrum spreader. These registers must be loaded in a spe-
cific manner with proper time delays. GCM0R is only read by the spectrum spreader at the
moment when the spectrum spreader is enabled by storing 0x080 in GCM1R. If GCM1R
is cleared (when disabling the spectrum spreader), there is up to a 500-clock delay before
the spectrum spreader is actually disabled. The proper procedure is to clear GCM1R, wait
for 500 clocks, set GCM0R, and then enable the spreader by storing 0x080 in GCM1R.
The spectrum spreader is applied to the main clock before the clock doubler, so if both are
enabled there will be additional asymmetry between alternate clock cycles.If the clock
doubler is used, the spectrum spreader affects every other cycle and reduces the clock high
time. If the doubler is not used, then the spreader affects every clock cycle, and the clock
low time is reduced.
12
Figure 2-2. Peak Spectral Amplitude Reduction by Spectrum Spreader
15
10
5
50
Normal Spreading
100
Strong Spreading
Frequency (MHz)
150
200
Rabbit 3000 Microprocessor User’s Manual
250
300
350
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