Cortex M4 Vector Table
Furthermore, each interrupt/exception also has a unique interrupt number assigned to it.
Cortex m4 vector table. As you can see, the interrupt vector table is an array of memory addresses. The interrupt vector table has eight entries. The ARM Cortex-M is a group of 32-bit RISC ARM processor cores licensed by Arm Holdings.These cores are optimized for low-cost and energy-efficient microcontrollers, which have been embedded in tens of billions of consumer devices.
– C start-up routine;. The vector table in ARM Cortex M series looks like:. As we have discussed in the last section, the vector table contains the address of the ISR routines of all interrupts and exceptions that the microcontroller supports.
Cortex M Vector Table. Each vector has 4 bytes, containing a branching instruction in one of the following forms:. Peripheral interrupts are also defined as simple exceptions in literature.
Upon encountering a B instruction, the ARM processor will jump immediately to the address given by adr, and will resume execution from there.The adr in the branch instruction is an offset from the current value of the program counter (PC) register. The Cortex ® -M4 with FPU CPU always fetches the reset vector on the ICode bus. The ARM core, up on boot up, loads the stack pointer with the value stored at offset 0.
– Program code – application code and data;. This would explain why this bit has to be set accordingly, telling the core to use the system bus and access the SRAM. Maybe on an interrupt the ICode bus is used, which cannot access the SRAM even when remapped (I don't know if this is true).
Cortex-M4 Program Image ECE 5655/4655 Real-Time DSP 3–11 Cortex-M4 Program Image † The program image in Cortex-M4 contains – Vector table -- includes the starting addresses of exceptions (vectors) and the value of the main stack point (MSP);. The cores consist of the Cortex-M0, Cortex-M0+, Cortex-M1, Cortex-M3, Cortex-M4, Cortex-M7, Cortex-M23, Cortex-M33, Cortex-M35P, Cortex-M55. It contains the starting address of all exception handlers.
If you check the datasheet of TM4C123G ARM Cortex M4 microcontroller, it has 15 system exceptions and 138 peripheral interrupts. Typically, on power-on reset, the Vector table base address is defined to be at 0. And then it loads the Program counter with the address available at offset 4 and starts executing.
The figure below shows the interrupt vector table of the ARM Cortex-M4 microcontroller.
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