Table of Contents
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Overview............................................................................................................................................................................................1-1
S3C80A5B Microcontroller..........................................................................................................................................................1-1
Features............................................................................................................................................................................................1-2
Block Diagram ................................................................................................................................................................................1-3
Pin Assignments............................................................................................................................................................................1-4
Pin Descriptions .............................................................................................................................................................................1-5
Pin Circuits ......................................................................................................................................................................................1-6
Overview............................................................................................................................................................................................2-1
Program memory (ROM) .............................................................................................................................................................2-2
Register Architecture....................................................................................................................................................................2-3
Register Page Pointer (PP)..............................................................................................................................................2-5
Register Set 1......................................................................................................................................................................2-6
Register Set 2......................................................................................................................................................................2-6
Prime Register Space........................................................................................................................................................2-7
Working Registers ..............................................................................................................................................................2-8
Using the Register Pointers .............................................................................................................................................2-9
Register Addressing......................................................................................................................................................................2-11
Common Working Register Area (C0H-CFH) ............................................................................................................2-13
4-Bit Working Register Addressing ...............................................................................................................................2-14
8-Bit Working Register Addressing ...............................................................................................................................2-16
System and User Stacks............................................................................................................................................................2-18
Overview............................................................................................................................................................................................3-1
Register Addressing Mode (R)........................................................................................................................................3-2
Indirect Register Addressing Mode (IR)........................................................................................................................3-3
Indexed Addressing Mode (X)..........................................................................................................................................3-7
Direct Address Mode (DA)...............................................................................................................................................3-10
Indirect Address Mode (IA)...............................................................................................................................................3-12
Relative Address Mode (RA)............................................................................................................................................3-13
Immediate Mode (IM) .........................................................................................................................................................3-14
S3C80A5B MICROCONTROLLER
Table of Contents
Part I - Programming Model
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