ARM Cortex M3 & M4 Chapter 4 - Architecture

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Presentation transcript:

ARM Cortex M3 & M4 Chapter 4 - Architecture RTLAB Wi Daehan

INDEX Operation modes and states Registers Special registers Floating point registers Behavior of the APSR (Application program status register) Memory system Exceptions & Interrupts SCB (System control block) Reset & Reset sequence

Operation modes and states

Registers R0 – R12 R13, stack pointer (SP) R14, link register (LR) R15, program counter (PC)

Special registers Program status registers MASK registers CONTROL register

Special registers Program status registers

Special registers Program status registers

Special registers MASK registers

Special registers CONTROL register

Floating point registers Single precision operation Define floating point operation behaviors Provide status information about operation results

Behavior of the APSR APSR contains status flags Integer operations (N-Z-C-V bits) Saturation arithmetic (Q bit) SIMD operations (GE bits)

Behavior of the APSR Integer status flags

Behavior of the APSR Q status flag

Behavior of the APSR GE bits

Memory system Memory system features 4GB linear address space Architecturally defined memory map Support for little endian and big endian memory systems Write buffer Memory Protection Unit (Optional) Unaligned transfer support

Memory system Memory map

Exceptions & Interrupts Various exception sources

Exceptions & Interrupts

Exceptions & Interrupts Nested vectored interrupt controller (NVIC) Flexible exception and interrupt management Nested exception/interrupt support Vectored exception/interrupt entry Interrupt masking

Exceptions & Interrupts Vector table

Exceptions & Interrupts Fault handling

SCB (System control block) Merged into the NVIC Controlling processor configurations (e.g., low power modes) Providing fault status information (fault status registers) Vector table relocation (VTOR)

Reset & Reset sequence Power on reset - reset everything in the microcontroller. System reset - reset just the processor and peripherals. Processor reset - reset the processor only.

Reset & Reset sequence

Reset & Reset sequence