Arm

The Application Program Status Register (APSR) in Arm Cortex-M is a 32-bit register that contains application-level status and control information. It provides details on the conditional execution status of an application program and allows modification of the condition flags. The APSR is made up of multiple fields that can be individually accessed to check or…

The Application Program Status Register (APSR) in Arm Cortex-M is a 32-bit register that contains application level status and control information. It provides details on the condition flags from previous instruction executions as well as information on the current processor state. The APSR allows monitoring and control of application programs in Arm Cortex-M processors. Overview…

The ARM Program Status Registers (PSRs) are special purpose 32-bit registers that control and reflect the state of the processor. The PSRs allow the operating system to quickly determine the current state of the processor, and allow low-level code to efficiently modify the execution environment. There are five PSRs – Current Program Status Register (CPSR),…

The Current Program Status Register (CPSR) in Arm Cortex-M is a 32-bit register that contains condition code flags, interrupt disable bits, current processor mode bits, and other status and control information. The CPSR allows the processor to keep track of the current execution state of a program and controls how instructions are executed. It plays…

LDR (Load/Store Doubleword Register) and STR (Store Register) are two common ARM instruction types used for memory access. The main difference between LDR and STR is that LDR loads data from memory into a register while STR stores data from a register into memory. Understanding when to use each can help optimize code for better…

The STR (store register) instructions in Arm Cortex-M processors are used to store data from a register to memory. They allow transferring a word (32 bits) or halfword (16 bits) from a register to a memory location. STR instructions are an essential part of programming on Cortex-M as they enable variables and data to be…

The LDR (LoaD Register) instructions in ARM Cortex-M are used to load data from memory into a register. The Cortex-M processors have several different addressing modes that can be used with the LDR instruction to specify the memory location to load from. LDR Basics The basic syntax of the LDR instruction is: LDR Rd, [Rn,…

The Thumb and Thumb2 instruction sets are both used in ARM processors, but there are some key differences between them. Thumb is a 16-bit instruction set that was introduced in ARMv4T processors as a space-efficient alternative to the 32-bit ARM instruction set. Thumb2, introduced in ARMv6T2 processors, expands on Thumb by adding some 32-bit instructions…

The NVIC (Nested Vectored Interrupt Controller) registers ISER, ICER, ISPR and ICPR are used to enable, disable, set pending, and clear pending interrupts in ARM Cortex-M processors. Understanding how to properly configure and use these registers is key to working with interrupts in Cortex-M devices. What are NVIC Registers? NVIC stands for Nested Vectored Interrupt…

Industrial motion control applications require precision, reliability, and flexibility. Nonvolatile-memory-based industrial controllers (NVICs) offer key advantages over traditional volatile memory-based controllers for motion control. This article examines the benefits of using NVICs for industrial motion control applications. Increased Reliability A key benefit of NVICs is increased reliability compared to traditional volatile memory controllers. Volatile memory…