S3C2440A
32-BIT CMOS
MICROCONTROLLER
USER'S MANUAL
Revision 1
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S3C2440A 32-Bit CMOS Microcontroller
User's Manual, Revision 1
Publication Number: 21-S3-C2440A-072004
© 2004 Samsung Electronics
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any
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S3C2440A MICROCONTROLLER iii
Table of Contents
Chapter 1 Product Overview
Introduction.........................................................................................................................................1-1
Features .............................................................................................................................................1-2
Block Diagram ....................................................................................................................................1-5
Pin Assignments.................................................................................................................................1-6
Signal Descriptions..............................................................................................................................1-20
S3C2440A Special Registers................................................................................................................1-26
Chapter 2 Programmer's Model
Overview .............................................................................................................................................2-1
Processor Operating States .........................................................................................................2-1
Switching State...........................................................................................................................2-1
Memory Formats.........................................................................................................................2-1
Big-Endian Format.......................................................................................................................2-2
Little-Endian Format ....................................................................................................................2-2
Instruction Length........................................................................................................................2-2
Operating Modes .........................................................................................................................2-3
Registers ....................................................................................................................................2-3
The Program Status Registers ......................................................................................................2-7
Exceptions .................................................................................................................................2-10
Interrupt Latencies .......................................................................................................................2-15
Reset .........................................................................................................................................2-15
iv S3C2440A MICROCONTROLLER
Table of Contents (Continued)
Chapter 3 ARM Instruction Set
Instruction Set Summay.......................................................................................................................3-1
Format Summary ........................................................................................................................3-1
Instruction Summary....................................................................................................................3-2
The Condition Field..............................................................................................................................3-4
Branch and Exchange (Bx)...................................................................................................................3-5
Instruction Cycle Times................................................................................................................3-5
Assembler Syntax .......................................................................................................................3-5
Using R15 as an Operand ............................................................................................................3-5
Branch and Branch with Link (B, Bl)......................................................................................................3-7
The Link Bit ................................................................................................................................3-7
Instruction Cycle Times................................................................................................................3-7
Assembler Syntax .......................................................................................................................3-8
Data Processing..................................................................................................................................3-9
Cpsr Flags ..................................................................................................................................3-11
Shifts .........................................................................................................................................3-12
Immediate Operand Rotates .........................................................................................................3-16
Writing to R15.............................................................................................................................3-16
Using R15 as an Operandy...........................................................................................................3-16
TEQ, TST, Cmp and Cmn Opcodes...............................................................................................3-16
Instruction Cycle Times................................................................................................................3-16
Assembler Syntax .......................................................................................................................3-17
Examples ...................................................................................................................................3-17
Psr Transfer (MRS, MSR).....................................................................................................................3-18
Operand Restrictions ...................................................................................................................3-18
Reserved Bits..............................................................................................................................3-20
Examples ...................................................................................................................................3-20
Instruction Cycle Times................................................................................................................3-20
Assembly Syntax ........................................................................................................................3-21
Examples ...................................................................................................................................3-21
Multiply And Multiply-Accumulate (MUL, MLA).......................................................................................3-22
Cpsr Flags ..................................................................................................................................3-24
Instruction Cycle Times................................................................................................................3-24
Assembler Syntax .......................................................................................................................3-24
Examples ...................................................................................................................................3-24
Multiply Long And Multiply-Accumulate Long (MULL, MLAL) ...................................................................3-25
Operand Restrictions ...................................................................................................................3-26
Cpsr Flags ..................................................................................................................................3-26
Instruction Cycle Times................................................................................................................3-26
Assembler Syntax .......................................................................................................................3-27
Examples ...................................................................................................................................3-27
S3C2440A MICROCONTROLLER v
Table of Contents (Continued)
Chapter 3 ARM Instruction Set (Continued)
Single Data Transfer (LDR, STR)...........................................................................................................3-28
Offsets and Auto-Indexing ............................................................................................................3-29
Shifted Register Offset .................................................................................................................3-29
Bytes and Words ........................................................................................................................3-29
Use of R15..................................................................................................................................3-31
Example.....................................................................................................................................3-31
Data Aborts ................................................................................................................................3-31
Instruction Cycle Times................................................................................................................3-31
Assembler Syntax .......................................................................................................................3-32
Examples ...................................................................................................................................3-33
Halfword and Signed Data Transfer (LDRH/STRH/LDRSB/LDRSH) ...........................................................3-34
Offsets and Auto-Indexing ............................................................................................................3-35
Halfword Load and Stores.............................................................................................................3-36
Use of R15..................................................................................................................................3-37
Data Aborts ................................................................................................................................3-37
Instruction Cycle Times................................................................................................................3-37
Assembler Syntax .......................................................................................................................3-38
Examples ...................................................................................................................................3-39
Block Data Transfer (LDM, STM)...........................................................................................................3-40
The Register List .........................................................................................................................3-40
Addressing Modes.......................................................................................................................3-41
Address Alignment ......................................................................................................................3-41
Use of the S Bit...........................................................................................................................3-43
Use of R15 as The Base ..............................................................................................................3-43
Inclusion of the Base in the Register List .......................................................................................3-44
Data Aborts ................................................................................................................................3-44
Instruction Cycle Times................................................................................................................3-44
Assembler Syntax .......................................................................................................................3-45
Examples ...................................................................................................................................3-46
Single Data Swap (SWP).....................................................................................................................3-47
Bytes and Words ........................................................................................................................3-47
Use of R15..................................................................................................................................3-48
Data Aborts ................................................................................................................................3-48
Instruction Cycle Times................................................................................................................3-48
Assembler Syntax .......................................................................................................................3-48
Software Interrupt (SWI) .......................................................................................................................3-49
Return from the Supervisor ...........................................................................................................3-49
Comment Field............................................................................................................................3-49
Instruction Cycle Times................................................................................................................3-49
Assembler Syntax .......................................................................................................................3-50
Coprocessor Data Operations (CDP).....................................................................................................3-51
Coprocessor Instructions..............................................................................................................3-51
Instruction Cycle Times................................................................................................................3-52
Examples ...................................................................................................................................3-52
