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

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 through 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 guideline extension and therefore many desktop and Server manufactures are introducing ARM-based desktop and Servers. Who will use our textbook? This publication is meant for either educational and readers. while you are utilizing this booklet for a college direction, the aid 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 loose to enforce the on-chip peripheral (ADC, Timers, I/O, etc.) as they select. because the ARM peripherals will not be commonplace one of the quite a few owners, we've committed a separate ebook to every seller.

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Here are some examples of how to use it: MOV R7,#8_33 ;R7 = 33 in base 8 or 011011 in binary format MOV R6,#2_10011001 ;R6 = 10011001 in base 2 or 99 in hex ASCII characters To represent ASCII data in an ARM assembler we use single quotes as follows: LDR R3,#‘2’ ;R3 = 00110010 or 32 in hex (See Appendix F) This is the same as other assemblers such as the 8051 and x86. 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.

It must be noted that the unused portion (the upper 24 bits) of the Rd register will be all zeros, as shown in Figure 2-7. There are situations that we do not need to bring 4 bytes of data into GPR. An UART register is such a case. The UART registers are generally 8-bit and take only one memory space location (memory mapped I/O). Using LDRB, we can bring into GPR a single byte of data from UART registers. This is a widely used instruction for accessing the 8-bit I/O and peripheral ports. STRB Rx,[Rd] instruction STRB Rx, [Rd] ;store the byte in register Rx into ;location pointed to by Rd The STRB instruction tells the CPU to store (copy) the byte value in Rx to an address location pointed to by the Rd register.

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.

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