ARM Assembly Language: Programming and Architecture by Muhammad Ali Mazidi, Sarmad Naimi, Visit Amazon's Sepehr

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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 via greater than 2 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 guide extension and consequently many machine and Server manufactures are introducing ARM-based machine and Servers. Who will use our textbook? This publication is meant for either educational and readers. while you're utilizing this publication for a college direction, the help fabrics and tutorials are available on www.MicroDigitalEd.com. This e-book 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 pick out. because the ARM peripherals should not regular one of the numerous proprietors, we now have devoted a separate e-book to every seller.

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It has the following formats: MOV Rn,Op2 ;load Rn register with Op2 (Operand2). If we see the word “immediate”, we are dealing with a constant value that must be provided right there with the instruction. The following instruction loads the R2 register with a value of 0x25 (25 in hex). MOV R2,#0x25 ;load R2 with 0x25 (R2 = 0x25) The following instruction loads the R1 register with the value 0x87 (87 in hex). MOV R1,#0x87 ;copy 0x87 into R1 (R1 = 0x87) The following instruction loads R5 with the value of R7.

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. Examine Example 2-5 to see the impact of the ADDS instruction on selected flag bits. See also Example 2-6 to see the impact of the SUBS instruction on selected flag bits. Example 2-5 Show the status of the C and Z flags after the addition of a) 0x0000009C and 0xFFFFFF64 in the following instruction: ;assume R1 = 0x0000009C and R2 = 0xFFFFFF64 ADDS R2,R1,R2 ;add R1 to R2 and place the result in R2 b) 0x0000009C and 0xFFFFFF69 in the following instruction: ;assume R1 = 0x0000009C and R2 = 0xFFFFFF69 ADDS R2,R1,R2 ;add R1 to R2 and place the result in R2 Solution: a) 0x0000009C 0000 0000 0000 0000 0000 0000 1001 1100 + 0xFFFFFF64 + 1111 1111 1111 1111 1111 1111 0110 0100 0x100000000 1 0000 0000 0000 0000 0000 0000 0000 0000 C = 1 because there is a carry beyond the D31 bit.

Gives a symbolic name to a numeric constant, a register-relative value or a PCrelative value. INCLUDE It adds the contents of a file to our program. Table 2- 7: Some Widely Used ARM Directive AREA The AREA directive tells the assembler to define a new section of memory. The memory can be code (instruction) or data and can have attributes such as ReadOnly, ReadWrite, and so on.

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