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PDF Rabbit2000 Data sheet ( Hoja de datos )
| Número de pieza | Rabbit2000 | |
| Descripción | Microprocessor Handbook | |
| Fabricantes | Rabbit Semiconductor | |
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Rabbit 2000® Microprocessor
Designer’s Handbook
019-0070 • 070720-L
The latest revision of this manual is available on the Rabbit Semiconductor Web
site, www.rabbit.com, for free, unregistered download.
1 page  
12 Troubleshooting Tips for New Rabbit-Based Systems ........................................................61
12.1 Initial Checks......................................................................................................................................... 61
12.2 Diagnostic Tests .................................................................................................................................... 61
12.2.1 Program to Transmit Diagnostic Tests.................................................................................. 61
12.2.2 Diagnostic Test #1: Toggle the Status Pin ............................................................................ 63
12.2.3 Diagnostic Test #2................................................................................................................. 64
A Supported Rabbit 2000 Baud Rates .....................................................................................67
B Wait State Bug......................................................................................................................69
B.1 Overview of the Bug............................................................................................................................... 69
B.2 Wait States In Data Memory .................................................................................................................. 69
B.3 Wait States in Code Memory.................................................................................................................. 70
B.3.1 Instructions Affected by the Wait State Bug ................................................................................... 70
B.3.1.1 Dynamic C version 7.05 ........................................................................................................ 71
B.3.1.2 Prior versions of Dynamic C ................................................................................................. 71
B.3.2 Output Enable Signal and Conditional Jumps ................................................................................. 72
B.3.2.1 Workaround for Wait State Bug with Conditional Jumps...................................................... 72
B.3.3 Output Enable Signal and Mul Instruction ...................................................................................... 73
B.3.4 Alternatives to Wait States in Code Memory .................................................................................. 73
B.4 Enabling Wait States .............................................................................................................................. 73
B.5 Summary................................................................................................................................................. 74
Index .............................................................................................................................................75
Rabbit 2000 Designer’s Handbookl
rabbit.com
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5 Page 
2.3 Power Consumption
When minimum power consumption is required, a 3.3 V power supply and a 3.6864 MHz or a 1.8432
MHz crystal will usually be good choices. Such a system can operate at the main 3.6864 MHz or 1.8432
MHz frequency either doubled or divided by 8 (or both). A further reduction in power consumption at the
expense of computing speed can be obtained by adding memory wait states. Operating at 3.6864 MHz,
such a system will draw approximately 11 mA at 3.3 V, not including the power required by the memory.
Approximately 2 mA is used for the oscillator and 9 mA is used for the processor. Reducing the processor
frequency will reduce current proportionally. At 1/4th the frequency or (0.92 MHz) the current consump-
tion will be approximately 4 mA. At 1/8th the frequency, (0.46 MHz) the total power consumption will be
approximately 3 mA, not including the memories. Doubling the frequency to 7.37 MHz will increase the
current to approximately 20 mA.
If the main oscillator is turned off and the microprocessor is operated at 32.768 kHz from the clock oscilla-
tor, the current will drop to about 200 µA exclusive of the current required by the memory. The level of
power consumption can be fine-tuned by adding memory wait states, which have the effect of reducing
power consumption. To obtain microampere level power consumption, it is necessary to use auto power-
down flash memories to hold the executing code. Standby power while the system is waiting for an event
can be reduced by executing long strings of multiply zero by zero instructions. Keep in mind that a Rabbit
operating at 3.68 MHz has the compute power of a Z180 microprocessor operating at approximately triple
the clock frequency (11 MHz).
2.4 Through-hole Technology
Most design advice given for the Rabbit assumes the use of surface-mount technology. However, it is pos-
sible to use the older through hole technology and develop a Rabbit system. One can use the Rabbit-based
Core Module, a small circuit board with a complete Rabbit core that includes memory and oscillators.
Another possibility is to solder the Rabbit processors by hand to the circuit board. This is not difficult and
is satisfactory for low-production volumes if the right technique is used.
Rabbit 2000 Designer’s Handbook
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5
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