Table of Contents
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3.1 Instruction Set Summay .................................................................................................................... 3-1
3.1.1 Format Summary................................................................................................................... 3-1
3.1.2 Instruction Summary.............................................................................................................. 3-2
3.2 The Condition Field........................................................................................................................... 3-4
3.3 Branch and Exchange (BX) ............................................................................................................... 3-5
3.3.1 Instruction Cycle Times.......................................................................................................... 3-5
3.3.2 Assembler Syntax.................................................................................................................. 3-5
3.3.3 Using R15 as an Operand...................................................................................................... 3-5
3.4 Branch and Branch with Link (B, BL) ................................................................................................. 3-7
3.4.1 The Link Bit ........................................................................................................................... 3-7
3.4.2 Instruction Cycle Times.......................................................................................................... 3-7
3.4.3 Assembler Syntax.................................................................................................................. 3-8
3.5 Data Processing................................................................................................................................ 3-9
3.5.1 CPSR Flags........................................................................................................................... 3-11
3.5.2 Shifts ..................................................................................................................................... 3-12
3.5.3 Immediate Operand Rotates .................................................................................................. 3-16
3.5.4 Writing to R15........................................................................................................................ 3-16
3.5.5 Using R15 as an Operand...................................................................................................... 3-16
3.5.6 Teq, Tst, Cmp and CMN Opcodes ......................................................................................... 3-16
3.5.7 Instruction Cycle Times.......................................................................................................... 3-17
3.6.8 Assembler Syntax.................................................................................................................. 3-17
3.6 PSR Transfer (MRS, MSR) ............................................................................................................... 3-19
3.6.1 Operand Restrictions ............................................................................................................. 3-19
3.6.2 Reserved Bits ........................................................................................................................ 3-21
3.6.3 Instruction Cycle Times.......................................................................................................... 3-21
3.6.4 Assembler Syntax.................................................................................................................. 3-22
3.7 Multiply and Multiply-Accumulate (MUL, MLA) .................................................................................. 3-23
3.7.1 CPSR Flags........................................................................................................................... 3-24
3.7.2 Instruction Cycle Times.......................................................................................................... 3-24
3.7.3 Assembler Syntax.................................................................................................................. 3-24
3.8 Multiply Long and Multiply-Accumulate Long (MULL, MLAL) ............................................................. 3-25
3.8.1 Operand Restrictions ............................................................................................................. 3-25
3.8.2 CPSR Flags........................................................................................................................... 3-26
3.8.3 Instruction Cycle Times.......................................................................................................... 3-26
3.8.4 Assembler Syntax.................................................................................................................. 3-27
3.9 Single Data Transfer (LDR, STR)...................................................................................................... 3-28
3.9.1 Offsets and Auto-Indexing ..................................................................................................... 3-29
3.9.2 Shifted Register Offset........................................................................................................... 3-29
3.9.3 Bytes and Words ................................................................................................................... 3-29
3.9.4 Use of R15............................................................................................................................. 3-31
3.9.5 Restriction on the Use of Base Register ................................................................................. 3-31
3.9.6 Data Aborts............................................................................................................................ 3-31
3.9.7 Instruction Cycle Times.......................................................................................................... 3-31
3.9.8 Assembler Syntax.................................................................................................................. 3-32
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Table of Contents
(Continued)
S3C2500B RISC MICROCONTROLLER
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