668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 26
![no-image](/images/no-image-200.jpg)
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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Quantity
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Part Number:
668-0011
Manufacturer:
Rabbit Semiconductor
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2.3.4 32 kHz Clock
The 32.768 kHz clock is used to drive the asynchronous serial bootstrap, the real-time
clock, the periodic interrupt, and the watchdog timers. If these features are not used in a
design, the use of the 32 kHz clock is optional.
A simplified version of the recommended oscillator circuit for the Rabbit 3000 is shown
below. The values of resistors and capacitors may need to be adjusted for various frequen-
cies and crystal load capacitances. Rabbit’s Technical Note TN235, “External 32.768 kHz
Oscillator Circuits,“ is available on the Rabbit Web site and goes into this circuit in detail.
Figure 2-4. Basic 32.768 kHz Oscillator Circuit
The 32.768 kHz circuit consumes microampere level currents and has a very high imped-
ance, making it susceptible to noise, moisture, and environmental contaminants. It is
strongly recommended to conformally coat this circuit to limit effects of temperature and
humidity on the oscillation frequency. Details about this requirement are available in
Rabbit’s Technical Note TN303, “Conformal Coating”, from the Rabbit Web site.
The 32.768 kHz oscillator is slow to start oscillating after power-on. For this reason, a
wait loop in the BIOS waits until this oscillator is oscillating regularly before continuing
the startup procedure. If the clock is battery-backed, there will be no startup delay since
the oscillator is already oscillating. The startup delay may be as much as 5 seconds.
Crystals with low series resistance (R < 35 k) will start faster.
16
Rabbit 3000 Microprocessor User’s Manual
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