Cortex-M35P

A tamper-resistant Cortex-M processor with optional software isolation using TrustZone for Armv8-M.

Block Diagram on Cortex-M35.

Getting Started

For embedded developers seeking to hinder physical tampering and achieve a higher level of security certification, Arm offers the Cortex-M35P: a robust, high-performing processor. It builds upon the proven Arm Cortex-M technology deployed in billions of SoCs, making physical and software security accessible for all developers. 

Physical security is generally complex – however, the ease-of-use of the Cortex-M35P processor, combined with the support of Arm and the Arm ecosystem, now open the door for embedded developers to deliver many new devices with physical resilience at the heart.

Specifications

Architecture Armv8-M Mainline (Harvard)
ISA Support Thumb/Thumb-2
Pipeline Three-stage
Software security Optional TrustZone for Armv8-M, stack pointers checking
Physical security Built-in protection from invasive and non-invasive attacks
DSP Extensions Optional DSP/SIMD instructions Single cycle 16/32-bit MAC Single cycle dual 16-bit MAC 8/16-bit SIMD arithmetic
Floating Point Unit Optional single precision floating point unit IEEE 754 compliant
Co-processor interface Optional dedicated co-processor bus interface for up to 8 co-processor units for custom compute
Memory Protection Optional Memory Protection Unit (MPU) with up to 16 regions per security state
Interrupts Non-Maskable Interrupt (NMI) and up to 480 physical interrupts with 8 to 256 priority levels
Wake-up Interrupt Controller Optional for waking up the processor from state retention power gating or when all clocks are stopped
Sleep Modes Integrated Wait for Event (WFE) and Wait for Interrupt (WFI) instructions with Sleep On Exit functionality
Debug Optional JTAG and Serial Wire Debug ports. Up to 8 Breakpoints and 4 Watchpoints
Trace Optional Instruction Trace (ETM), Micro Trace Buffer (MTB), Data Trace (DWT), and Instrumentation Trace (ITM)
Cache Instruction cache

Key technical features


Cortex-M35P extends the anti-tampering features of the SecurCore family of processors, making this state-of-the art technology available to Cortex-M developers. Robust embedded security is more accessible than ever with the benefits of both physical and software security, using the optional TrustZone isolation.


Resilience against physical attacks

When the value of the protected assets is high, then hackers will resort to physical attacks on the device. The processor is built with multiple elements to protect from and detect such attacks.


TrustZone for Armv8-M

A foundation for security for embedded devices. TrustZone offers software isolation to code, memory and I/O while retaining the requirements of embedded applications: real-time deterministic response, minimal switching overhead, and ease of software development.

Interested in learning how to program Secure and Non-secure domains on a processor with TrustZone?

Explore more resources and get your questions answered on our TrustZone for Armv8-M Community.


Instruction cache

An integrated cache improves performance when running from embedded flash. The cache is resilient to physical attacks. The user can modify the customizable cache parity into an ECC (error correcting code) for safety applications.


Co-processor interface

A dedicated bus for extending the operation of the processor with tightly coupled co-processors to handle frequent and compute intensive operations in an ecosystem friendly manner. The interface supports up to eight accelerators and takes into account the security state of the co-processor.


Digital Signal Processing (DSP), SIMD, saturating arithmetic, fast MAC

Powerful instruction set for accelerating DSP applications, built right into the processor. A highly optimized DSP library built using these instructions is available free-of-charge from the Arm website (CMSIS Library).


Memory Protection Unit (MPU)

Software reliability and system security improves when each module is allowed access only to specific areas of memory required for it to operate. This protection prevents unexpected access that may overwrite critical data. Each of the security zones can have a dedicated MPU that may be configured with a different number of regions. Programming the regions is easier, removing the constraint to align regions on power-of-two size.


Integrated Nested Vectored Interrupt Controller (NVIC)

There is no need for a standalone external interrupt controller. Interrupt handling is taken care of by the NVIC removing the complexity of managing interrupts manually via the processor.


Powerful debug and non-intrusive real-time trace

Comprehensive debug and trace features dramatically improve developer productivity. Debug support and cycle accurate non-intrusive instruction and data trace for all stages of development supports high stakes secure projects as they move through development lifecycle.

The Cortex-M35P processor achieves an optimal blend between real-time determinism, energy efficiency, software productivity and a robust security foundation, using isolation to protect valuable IP and data with TrustZone technology and physical security.


  • A program that is running on a desktop.
  • White Paper: Armv8-M architecture

    Download this White Paper to get a technical overview of the Armv8-M architecture and an introduction to TrustZone security technology.

    Read here
  • a ulink, a board, a desktop.
  • Embedded development tools for Cortex-M series

    Arm and its ecosystem partners provide a wide range of tools for embedded software development on Arm Cortex-M processors.

    Learn more

Get Support

Arm Support

Arm training courses and on-site system-design advisory services enable licensees to efficiently integrate the Cortex-M35P processor into their design to realize maximum system performance with lowest risk and fastest time-to-market.

Arm training courses  Arm Design Reviews  Open a support case

Related IP and tools

The Cortex-M35P processor can be incorporated into an SoC using a broad range of Arm technology, including system IP and physical IP, speeding up time to market and optimizing implementation. It is fully supported by development tools from Arm and the world’s #1 embedded ecosystem.

Related IP and tools include:

Related IP

Tools

SCA mitigation IP

Arm DS-5 Development Studio

IoT SoC solutions

Arm Compiler

TrustZone CryptoIsland and CryptoCell

Cortex-M Prototyping System

Cortex-M System Design Kit

Fast Models

AMBA System Controllers

TrustZone for Armv8-M 

Arm CoreLink CG092 AHB flash cache

Community Blogs

Community Forums

Not answered MPU and TrustZone 0 votes 15 views 0 replies Started 8 hours ago by Talk2Joseph Answer this
Suggested answer Cortex A15 SCU
  • Cortex-A15
  • Cortex-A
0 votes 267 views 1 replies Latest 9 hours ago by Christopher Tory Answer this
Suggested answer WT it non cache able memory when it broadcast at transaction
  • Cortex-A53
  • Cortex-A
0 votes 165 views 1 replies Latest 9 hours ago by Christopher Tory Answer this
Not answered Understanding XDMAC on Cortex-M7
  • cortex-m7
  • Cortex-M
0 votes 17 views 0 replies Started 9 hours ago by Paul Braman Answer this
Not answered How can I debug two A53 cores in DS-5 tool 0 votes 19 views 0 replies Started 19 hours ago by DriverLike Answer this
Suggested answer reference source code to verify the Cortex-R52
  • cortex-r52
  • Evaluation Boards
0 votes 91 views 1 replies Latest 19 hours ago by Jorney Answer this
Not answered MPU and TrustZone Started 8 hours ago by Talk2Joseph 0 replies 15 views
Suggested answer Cortex A15 SCU Latest 9 hours ago by Christopher Tory 1 replies 267 views
Suggested answer WT it non cache able memory when it broadcast at transaction Latest 9 hours ago by Christopher Tory 1 replies 165 views
Not answered Understanding XDMAC on Cortex-M7 Started 9 hours ago by Paul Braman 0 replies 17 views
Not answered How can I debug two A53 cores in DS-5 tool Started 19 hours ago by DriverLike 0 replies 19 views
Suggested answer reference source code to verify the Cortex-R52 Latest 19 hours ago by Jorney 1 replies 91 views