Download Rabbit 2000 Microprocessor Designer`s Handbook

5.2.4 The Stack Segment..................................................................................................................26
5.2.5 The Extended Memory Segment.............................................................................................26
5.3 How The Compiler Compiles to Memory ...............................................................................................26
5.3.1 Placement of Code in Memory................................................................................................26
5.3.2 Paged Access in Extended Memory........................................................................................27
6
The Rabbit BIOS..................................................................................................................29
6.1
6.2
6.3
6.4
6.5
7
Startup Conditions Set Up By the BIOS..................................................................................................30
BIOS Flowchart .......................................................................................................................................31
Internally Defined Macros.......................................................................................................................32
Modifying the BIOS ................................................................................................................................32
Origin Statements to the Compiler ..........................................................................................................34
6.5.1 Origin Statement Syntax .........................................................................................................34
6.5.2 Origin Statement Semantics ....................................................................................................34
6.5.3 Origin Statement Examples.....................................................................................................36
6.5.4 Origin Directives in Program Code.........................................................................................37
The System ID Block ...........................................................................................................39
7.1 Definition of SysIDBlock ........................................................................................................................40
7.2 Access ......................................................................................................................................................41
7.2.1 Reading the System ID Block .................................................................................................41
7.2.2 Writing the System ID Block ..................................................................................................41
7.3 Determining the Existence of the System ID Block................................................................................42
8
BIOS Support for Program Cloning.....................................................................................45
8.1 Overview of Cloning ...............................................................................................................................45
8.1.1 Evolution of Cloning Support .................................................................................................46
8.2 Creating a Clone ......................................................................................................................................46
8.2.1 Steps to Enable and Set Up Cloning .......................................................................................46
8.2.2 Steps to Perform Cloning ........................................................................................................46
8.2.3 LED Patterns ...........................................................................................................................47
8.3 Cloning Questions ...................................................................................................................................47
8.3.1 MAC Address..........................................................................................................................47
8.3.2 Different Flash Sizes ...............................................................................................................48
8.3.3 Design Restrictions .................................................................................................................48
9
Low-Power Design and Support ..........................................................................................49
9.1 Software Support for Low-Power Sleepy Modes....................................................................................52
9.2 Baud Rates in Sleepy Mode.....................................................................................................................52
10
Memory Planning.................................................................................................................53
10.1 Making a RAM-Only Board..................................................................................................................53
10.1.1 Hardware Changes ................................................................................................................53
10.1.2 Software Changes..................................................................................................................54
11
Flash Memories ....................................................................................................................55
11.1 Supporting Other Flash Devices ............................................................................................................58
11.2 Writing Your Own Flash Driver ............................................................................................................59
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