Author: Ryan Ryan

The ARM Cortex-M4 processor contains 37 registers in total. These registers can be categorized into the following types: General Purpose Registers The Cortex-M4 contains 13 general purpose 32-bit registers named R0-R12. These registers can be used for various data processing and address calculations. R13-R15 have special functions as listed below. Special Registers The Stack Pointer

The link register and stack pointer are two important registers used for different purposes in ARM Cortex processors. The main differences between the two can be summarized as: To summarize, the link register handles return addresses for function calls while the stack pointer handles allocation/deallocation of stack memory during program execution. The LR is associated