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
3.3.2 Assembler Syntax.................................................................................................................. 3-5
3.4.1 The Link Bit ........................................................................................................................... 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
3.5.4 Writing to R15........................................................................................................................ 3-16
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
3.6.4 Assembler Syntax.................................................................................................................. 3-22
3.7.1 CPSR Flags........................................................................................................................... 3-24
3.7.3 Assembler Syntax.................................................................................................................. 3-24
3.8.1 Operand Restrictions ............................................................................................................. 3-25
3.8.2 CPSR Flags........................................................................................................................... 3-26
3.8.4 Assembler Syntax.................................................................................................................. 3-27
3.9.3 Bytes and Words ................................................................................................................... 3-29
3.9.4 Use of R15............................................................................................................................. 3-31
3.9.6 Data Aborts............................................................................................................................ 3-31
3.9.8 Assembler Syntax.................................................................................................................. 3-32
iv
Table of Contents
(Continued)
S3C2501X