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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? presently ARM CPU is approved and produced by means 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 guide extension and consequently many computer and Server manufactures are introducing ARM-based computer and Servers. Who will use our textbook? This e-book is meant for either educational and readers. when you are utilizing this e-book for a college path, the aid fabrics and tutorials are available on This ebook covers the meeting language programming of the ARM chip. The ARM meeting language is commonplace despite who makes the chip. The ARM licensees are loose to enforce the on-chip peripheral (ADC, Timers, I/O, etc.) as they decide on. because the ARM peripherals aren't average one of the a number of proprietors, we now have committed a separate e-book to every seller.

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What does “STRB R1, [R2]” do? 8. What is the largest hex value that can be moved into four consecutive locations in the data memory? What is the decimal equivalent of the hex value? 4: ARM CPSR (Current Program Status Register) Like all other microprocessors, the ARM has a flag register to indicate arithmetic conditions such as the carry bit. Chapters 3 and 4 show how the flag bits of the status register are used. ARM current program status register The status register is a 32-bit register. Each of the conditional flags can be used to perform a conditional branch (jump), as we will see in Chapter 4.

The branch instructions are in this category. , ANDS) are in this category. Table 2-5 shows the instructions and the flag bits affected by them. Appendix A provides a complete list of all the instructions and their associated flag bits. Instruction Flags Affected ANDS C, Z, N ORRS C, Z, N MOVS C, Z, N ADDS C, Z, N, V SUBS C, Z, N, V B No flags Note that we cannot put S after B instruction. Table 2- 5: Flag Bits Affected by Different Instructions Flag bits and decision making There are instructions that will make a conditional jump (branch) based on the status of the flag bits.

Directive AREA END ENTRY EQU Description Instructs the assembler to assemble a new code or data section Informs the assembler that it has reached the end of a source file. Declares an entry point to a program. 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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