Maxim-integrated MAXQ622 Bedienungsanleitung PDF herunterladen (Seite 5)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 2-1

SECTION 2: ARCHITECTURE

2.1 Instruction Decoding .......................................................................2-4

2.2 Register Space............................................................................2-5

2.3 Memory Organization.......................................................................2-6

2.3.1 Program Memory .....................................................................2-6

2.3.2 Utility ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

2.3.3 Data Memory ........................................................................2-7

2.3.4 Stack Memory........................................................................2-8

2.4 Memory Management Unit...................................................................2-8

2.5 Memory Mapping..........................................................................2-8

2.5.1 Memory Mapping Into Data Space .......................................................2-9

2.5.2 Memory Mapping into Code Space.......................................................2-12

2.5.3 Memory Mapping Rules ................................................................2-14

2.5.4 Code Examples ......................................................................2-15

2.6 Memory Protection .........................................................................2-16

2.6.1 Rules for System Software ..............................................................2-17

2.6.2 Privilege Exception Interrupt ............................................................2-18

2.6.3 Memory Access Protection Impact on Data Pointers (and Code Pointer) .........................2-18

2.6.4 Debugging ..........................................................................2-20

2.6.5 Enabling Memory Protection ............................................................2-20

2.6.6 Reset Procedure and Setup of Memory Protection ...........................................2-20

2.6.7 Loader Access Control ................................................................2-22

2.6.8 Disabling MAXQ612/MAXQ622-Specific Memory Access Features ..............................2-23

2.7 Clock Generation ..........................................................................2-23

2.7.1 External Clock (Crystal/Resonator) .......................................................2-23

2.7.2 External Clock (Direct Input) ............................................................2-25

2.7.3 Internal System Clock Generation ........................................................2-25

2.8 Wake-Up Timer ...........................................................................2-25

2.8.1 Using the Wake-Up Timer to Exit Stop Mode ...............................................2-26

2.9 Interrupts ................................................................................2-26

2.9.1 Servicing Interrupts ...................................................................2-26

2.9.2 Interrupt System Operation .............................................................2-26

2.9.3 Synchronous vs. Asynchronous Interrupt Sources ...........................................2-27

2.9.4 Interrupt Prioritization by Software ........................................................2-27

2.9.5 Interrupt Exception Window .............................................................2-29

2.10 Operating Modes .........................................................................2-29

2.11 Reset Mode .............................................................................2-29

2.11.1 Power-On/Power-Fail Reset ............................................................2-29

This section contains the following information:

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