Rabbit Rabbit 4000, User Manual

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Table of Contents
T
ABLE OF
C
ONTENTS
Chapter 1. The Rabbit 4000 Processor 1
1.1 Introduction...........................................................................................................................................1
1.2 Features .................................................................................................................................................1
1.3 Block Diagram ......................................................................................................................................4
1.4 Basic Specifications ..............................................................................................................................5
1.5 Comparing Rabbit Microprocessors .....................................................................................................6
Chapter 2. Clocks 9
2.1 Overview...............................................................................................................................................9
2.1.1 Block Diagram ...........................................................................................................................10
2.1.2 Registers .....................................................................................................................................10
2.2 Dependencies ......................................................................................................................................11
2.2.1 I/O Pins ......................................................................................................................................11
2.2.2 Other Registers ...........................................................................................................................11
2.3 Operation ............................................................................................................................................12
2.3.1 Main Clock .................................................................................................................................12
2.3.2 Spectrum Spreader .....................................................................................................................13
2.3.3 Clock Doubler ............................................................................................................................15
2.3.4 32 kHz Clock .............................................................................................................................18
2.4 Register Descriptions ..........................................................................................................................20
Chapter 3. Reset and Bootstrap 25
3.1 Overview.............................................................................................................................................25
3.1.1 Block Diagram ...........................................................................................................................25
3.1.2 Registers .....................................................................................................................................26
3.2 Dependencies ......................................................................................................................................26
3.2.1 I/O Pins ......................................................................................................................................26
3.2.2 Clocks .........................................................................................................................................26
3.2.3 Other Registers ...........................................................................................................................26
3.2.4 Interrupts ....................................................................................................................................26
3.3 Operation ............................................................................................................................................27
3.4 Register Descriptions ..........................................................................................................................29
Chapter 4. System Management 31
4.1 Overview.............................................................................................................................................31
4.1.1 Block Diagram ...........................................................................................................................32
4.1.2 Registers .....................................................................................................................................32
4.2 Dependencies ......................................................................................................................................33
4.2.1 I/O Pins ......................................................................................................................................33
4.2.2 Clocks .........................................................................................................................................33
4.2.3 Interrupts ....................................................................................................................................33
4.3 Operation ............................................................................................................................................34
4.3.1 Periodic Interrupt .......................................................................................................................34
4.3.2 Real-Time Clock ........................................................................................................................34
4.3.3 Watchdog Timer ........................................................................................................................35
4.3.4 Secondary Watchdog Timer .......................................................................................................35
4.4 Register Descriptions ..........................................................................................................................36