By Muhammad Ali Mazidi, Sarmad Naimi, Visit Amazon's Sepehr Naimi Page, search results, Learn about Author Central, Sepehr Naimi, , Shujen Chen
Who makes use of ARM? at the moment ARM CPU is approved and produced by way of greater than two hundred businesses and is the dominant CPU chip in either cellphones and drugs. Given its RISC structure and robust 32-bit directions set, it may be used for either 8-bit and 32-bit embedded items. The ARM corp. has already outlined the 64-bit guideline extension and hence many machine and Server manufactures are introducing ARM-based machine and Servers. Who will use our textbook? This ebook is meant for either educational and readers. when you are utilizing this publication for a college direction, the help fabrics and tutorials are available on www.MicroDigitalEd.com. This ebook covers the meeting language programming of the ARM chip. The ARM meeting language is normal despite who makes the chip. The ARM licensees are unfastened to enforce the on-chip peripheral (ADC, Timers, I/O, etc.) as they decide upon. because the ARM peripherals should not commonplace one of the numerous proprietors, we now have devoted a separate e-book to every seller.
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Additional info for ARM Assembly Language: Programming and Architecture
Assume R5 = 0x40000200 LDR R7,[R5] ;load R7 with the contents of locations ;0x40000200-0x40000203 Figure 2-5: Executing the LDR Instruction STR Rx,[Rd] instruction STR Rx,[Rd] ;store register Rx into locations pointed to by Rd The STR instruction tells the CPU to store (copy) the contents of the GPR to a base address location pointed to by the Rd register. Notice that the source register of STR instruction is placed before the destination register. Obviously since GPR is 32-bit wide (4-byte) we need four consecutive memory locations to store the contents of GPR.
Here is another example: LDR R2,#‘9’ ;R2 = 0x39, which is hex number for ASCII ‘9’ To represent a string, double quotes are used; and for defining ASCII strings (more than one character), we use the DCB directive. Assembler directives While instructions tell the CPU what to do, directives (also called pseudoinstructions) give directions to the assembler. For example, the MOV and ADD instructions are commands to the CPU, but EQU, END, and ENTRY are directives to the assembler. The following section presents some widely used directives of the ARM and how they are used.
Chapter 4 shows how the carry flag is used. See Chapter 4 to see how we use the Z flag for looping. The negative and V flag bits are used for the signed number arithmetic operations and are discussed in Chapter 5. The V and N flag bits are used for signed number arithmetic operations and are discussed in Chapter 5. See the ARM manual. S suffix and the status register Most of ARM instructions can affect the status bits of CPSR according to the result. That means, for example, ADDS instead of ADD is used.
ARM Assembly Language: Programming and Architecture by Muhammad Ali Mazidi, Sarmad Naimi, Visit Amazon's Sepehr Naimi Page, search results, Learn about Author Central, Sepehr Naimi, , Shujen Chen