Arm programmer's model

In this presentation we can learn the basic concept of Arm Programmer's Model and different registers and its functions.

1. MICROCONTROLLER BASED SYSTEM DESIGN “ ARM PROGRAMMER'S MODEL ” V. KALAIRAJAN M.E; ASSISTANT PROFESSOR, ELECTRICAL AND ELECTRONICS ENGINEERING, KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY. 1 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

2. “ARM PROGRAMMER'S MODEL” VIEWS: ARM PROGRAMER'S MODEL. ARM REGISTERS. THREE SPECIAL FUNCTION REGISTERS. THE CURRENT PROGRAM STATUS REGISTER (CPSR). CONCLUSION. REFERENCES. 2 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

3. “ARM PROGRAMMER'S MODEL” ARM PROGRAMER'S MODEL ARM is a flexible programmer’s designed architecture with different applications. Design is simple, optimum and economic. A processor's instruction set defines the operations that the programmer can use to change the state of the system incorporating the processor. This state usually comprises the values of the data items in the processor's visible registers and the system's memory. Each instruction can be viewed as performing a defined transformation from the state before the instruction is executed to the state after it has completed. 3 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

4. “ARM PROGRAMMER'S MODEL” ARM REGISTERS: ARM has 31 general purpose 32 bit registers. 16 registers only visible register. 16 registers are user mode registers. Other registers are used to speed up execution processing. 16 registers are R0 to R15. In this three registers(R13,R14,R15) are special purpose registers. These three registers used for only important functions in the program. 4 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

5. “ARM PROGRAMMER'S MODEL” 5 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

6. “ARM PROGRAMMER'S MODEL” THREE SPECIAL FUNCTION REGISTERS: Stack pointer. Link Register. Program counter. STACK POINTER (R13): It is used to store the head of the stack in the current processor mode. LINK REGISTER(R14): It is used when the interrupt is used in program. It is used to return when subroutine calls occurred. PROGRAM COUNTER(R15): It is used to store the address of next instruction to be execute. 6 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

7. “ ARM PROGRAMMER'S MODEL ” THE CURRENT PROGRAM STATUS REGISTER (CPSR): CPSR is used to store the current status of ALU after execution of operations. The CPSR is used in user-level programs to store the condition code bits. These bits are used, for example, to record the result of a comparison operation and to control whether or not a conditional branch is taken. 7 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

8. “ ARM PROGRAMMER'S MODEL ” N: NEGATIVE: The last ALU operation which changed the flags produced a negative result (the top bit of the 32-bit result was a one). Z: ZERO: The last ALU operation which changed the flags produced a zero result (every bit of the 32-bit result was zero). C: CARRY: The last ALU operation which changed the flags generated a carry-out, either as a result of an arithmetic operation in the ALU or from the shifter. V: OVERFLOW: The last arithmetic ALU operation which changed the flags generated an overflow into the sign bit. 8 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL

9. “ ARM PROGRAMMER'S MODEL ” CONCLUSION: In this above presentation we can learn about basic concept of ARM programmers model , ARM registers, special registers, and purpose of CPSR clearly. REFERENCES: Mazidi , M.A.,“PIC Microcontroller” Rollin Mckinlay , Danny causey Printice Hall of India, 2007. Ravichandran,C ., and Arulaalan,M ., “Microcontroller Based System Design”, Suchitra Publications, Ist edition,2016. Dr.Balamurugan.C.R ., Periyaazhagar ., “Microcontroller Based System Design”, Megnus Publications, Ist edition,2016. Online wikipedia search. 9 KONGUNADU COLLEGE OF ENGINERING AND TECHNOLOGY, TRICHY ARM PROGRAMER'S MODEL