Rabbit 2000™ Microprocessor - UTN

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6 Rabbit 2000 Microprocessor
3. Core Design and ComponentsCore designs can be developed around the Rabbit 2000 microprocessor. A core design includesmemory, the microprocessor, oscillator crystals, the Rabbit standard programming port, and insome cases a power controller and power supply. Although modern designs usually use at leastfour-layer printed circuit boards, two-sided boards are a viable option with the Rabbit, especially ifthe clock speed is not high and the design is intended to operate at 2.5 V or 3.3 V—factors whichreduce edge speed and electromagnetic radiation.Schematics illustrating the use of the Rabbit microprocessor are available at www.rabbitsemiconductor.com.3.1 ClocksThe Rabbit has two built-in oscillators. The 32.768 kHz clock oscillator is needed for the batterybackableclock (aka, the real-time clock), the watchdog timer, and the cold boot function. The highfrequency main oscillator is generally used to provide the main CPU clock.XTALA2330 kW15 pFXTALB22 kW33 pF10 MWCL = 12.5 pF32.768 kHz1 MWCL = 20 pF11.0592 MHzXTALA115 pFXTALB133 pF(a) 32.768 kHz Oscillator(b) Main OscillatorFigure 2. Rabbit 2000 Oscillator CircuitsThe 32.768 kHz oscillator is slow to start oscillating after power-on. For this reason a wait loop inthe BIOS waits until this oscillator is oscillating regularly before continuing the startup procedure.The startup delay may be as much as 5 seconds. Crystals with low series resistance (R < 35 kW)will start faster. If the clock is battery-backed, there will be no startup delay since the oscillator isalready oscillating.Designer’s Handbook 7
Page 1 and 2: Rabbit 2000 MicroprocessorDesigner
Page 3 and 4: Table of Contents1 Introduction ...
Page 5 and 6: Instructions Affected by the Wait S
Page 7 and 8: 1. IntroductionThis manual is inten
Page 9 and 10: 2. Rabbit Hardware DesignOverviewBe
Page 11: 2.3 Power ConsumptionWhen minimum p
Page 15 and 16: 3.2 Basic Memory DesignNormally /CS
Page 17 and 18: 3.3 PC Board Layout and Memory Line
Page 19 and 20: With a Rabbit-based system it is ea
Page 21 and 22: 3.4.2.3 High Frequency Oscillator C
Page 23 and 24: 3.4.2.4 Processor DecouplingThe int
Page 25 and 26: 4. How Dynamic C Cold Boots theTarg
Page 27 and 28: 4.2 Program Loading Process Overvie
Page 29 and 30: 5. Rabbit Memory OrganizationThe Ra
Page 31 and 32: 5.2.1 DefinitionsExtended Code: Ins
Page 33 and 34: 5.3.2 Paged Access in Extended Memo
Page 35 and 36: 6. The Rabbit BIOSWhen Dynamic C co
Page 37 and 38: 6.2 BIOS FlowchartThe following flo
Page 39 and 40: DATAORGBeginning logical address fo
Page 41 and 42: All origin statements must have a u
Page 43 and 44: 7. The System ID BlockThe BIOS supp
Page 45 and 46: 7.2 AccessThe BIOS will read the sy
Page 47 and 48: Table 4. The System ID Block (Conti
Page 49 and 50: 8. BIOS Support for ProgramCloningT
Page 51 and 52: 8.2.3 LED PatternsThe following tab
Page 53 and 54: 9. Low-Power Design and SupportTo g
Page 55 and 56: 9.1 Software Support for Low-Power
Page 57 and 58: 10. Memory PlanningThe following re
Page 59 and 60: 11. Flash MemoriesThe flash memorie
Page 61 and 62: Table 7. 32-Pin Flash Memories Supp
Page 63 and 64:
The field flashXPC contains the XPC
Page 65 and 66:
12. Troubleshooting Tips for NewRab
Page 67 and 68:
80 24 80 //terminate bootstrap, sta
Page 69 and 70:
Appendix A. Supported Rabbit 2000Ba
Page 71 and 72:
Appendix B.Wait State BugB.1 Overvi
Page 73 and 74:
If the atomic nature of the operati
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B.4 Enabling Wait StatesMemory wait
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Legal NoticeRabbit Semiconductor pr
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Rabbit 2000™ Microprocessor - UTN

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