Vector Table Mapped to Address 0 at Reset
#Interrupt vector table emu8086 code
Therefore, the first 15+138 locations of code memory starting from 0x0000_0000 contain the address of exception and interrupt handlers. TM4C123G microcontroller starting address of flash/code memory consists of a vector table and vector table values contains the addresses of interrupt or exception handlers.Īs shown in figure below, TM4C123GH6PM microcontroller has 15 exceptions and 138 IRQ interrupts. Understand the Startup file of TM4C123G Microcontrollersīefore understanding the startup file, let’s have a quick review of the vector table. Startup.s or startup.c file is architecture-dependent, especially the vector table part. The startup file also contains definitions of these interrupt or exception routines such as reset handler, NMI handler, bus fault handler, etc. It also contains an array of function pointers ( interrupt vector table) that point to various interrupt vector routines such as interrupts and exceptions.Allocate space for the stack and initialize the stack pointer.bss section of RAM memory and initialize. Copying uninitialized global, global static, and local static variable data from flash to.data section RAM memory of a microcontroller Copying initialized global, global static, and local static variable data from flash to.The startup file consists of this reset handler function and hardware initialization code.įollowing are the main functions of a startup file: As we have seen in the last tutorial when a microcontroller resets, it executes a reset handler (interrupt service routine) and performs hardware initialization before executing the main code. The startup file performs various initializations and contains code for interrupt vector routines. Therefore, a startup file always runs before the main() code of our embedded application.
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It performs various initialization steps by setting up the hardware of the microcontroller so that the user application can run.
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What is a startup file in microcontrollers?Ī startup file is a piece of code written in assembly or C language that executes before the main() function of our embedded application. Interrutp Vector table Array of function Pointers.Understand the Startup file of TM4C123G Microcontrollers.What is a startup file in microcontrollers?.