Cortex-M1

The first Arm processor designed specifically for implementation in FPGAs. 

Getting Started

The Cortex-M1 processor targets FPGA devices and includes support for leading FPGA synthesis tools allowing the designer to choose the optimal implementation for each project. The Cortex-M1 processor enables OEMs to achieve significant cost savings through rationalization of software and tools investments across multiple projects spanning FPGA, ASIC and ASSP, plus greater vendor independence through use of an industry-standard processor.

Key features

  • Three-stage, 32-bit RISC processor
  • Thumb-2 instruction set
  • Integrated nested vectored interrupt controller
  • Fast or small multiplier configuration options

DesignStart FPGA

Get instant and free access to Cortex-M1 soft IP for evaluation, research and commercial production with Arm's FPGA partners.


Specifications

Architecture Armv6-M
ISA Thumb and Thumb-2 (except CBZ, CBNZ, IT, BL, DMB, DSB, ISB, MRS, MSR)
Pipeline Three-stage
SysTick Timer Optional
Bit Manipulation Optional bit-banding
Interrupts 1 – 32 interrupts (configurable)
Interrupt Priority Levels 4 priority levels per interrupt
Instruction and Data Tightly Coupled Memories 0K - 1024K (configurable)
Debug Full or reduced debug (full - 4 breakpoint comparators, 2 watchpoint comparators)
Dual Core Lock-Step Support
Yes

Compare all Cortex-M processors

  • Manual containing technical information.
  • Cortex-M1 Technical Reference Manual

    For system designers, integrators and testers, the Technical Reference Manual (TRM) provides details of the Cortex-M1 processor.

    Read here
  • Manual containing technical information.
  • Cortex-M1 FPGA Development Kit Cortex-M1 User Guide

    For FPGA system designers and programmers who want to incorporate and program the Cortex-M1 processor in their own SoC design using an Altera FPGA and Altera System-On-a-Programmable-Chip (SOPC) Builder. 

    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
  • Manual containing technical information.
  • Cortex-M Resources

    Further resources for Cortex-M developers. 

    Read here

Cortex-M Comparison Table

Feature  Cortex-M0 Cortex-M0+ Cortex-M1 Cortex-M23 Cortex-M3 Cortex-M4  Cortex-M33 Cortex-M35P  Cortex-M7 
Instruction set architecture  Armv6-M Armv6-M
Armv6-M
Armv8-M Baseline 
Armv7-M Armv7-M
Armv8-M Mainline
Armv8-M Mainline
Armv7-M
Thumb, Thumb-2  Thumb, Thumb-2
Thumb, Thumb-2
Thumb, Thumb-2
Thumb, Thumb-2
Thumb, Thumb-2
Thumb,
Thumb-2
Thumb,
Thumb-2
Thumb,
Thumb-2
DMIPS/MHz range*
0.87-1.27  0.95-1.36  0.8
0.99  1.25-1.89  1.25-1.95  1.5  1.5  2.14-3.23
CoreMark®/MHz*
2.33 2.46  1.85
2.5 3.34 3.42  4.02 4.02 5.01
Pipeline stages
Memory Protection Unit (MPU)  No  Yes (option) No  Yes (option)
(2 x) 
Yes (option)  Yes (option)  Yes (option)
(2 x) 
Yes (option)
(2 x) 
Yes (option) 
Maximum MPU regions  16  16  16  16 
Trace (ETM or MTB)  No  MTB (option)  No  MTB (option) or 
ETMv3 (option) 
ETMv3 (option)  ETMv3 (option)  MTB (option) and/or
ETMv4 (option) 
MTB (option) and/or
ETMv4 (option) 
ETMv4 (option)
DSP  No  No  No  No  No Yes  Yes (option) Yes (option)  Yes 
Floating point hardware  No No  No  No  No Yes (option SP) Yes (option SP)  Yes (option SP)  Yes
(option SP + DP) 
Systick Timer
Yes (option)  Yes (option)  Yes (option)  Yes (2 x)  Yes Yes Yes (2 x) Yes (2 x) Yes
Built-in Caches  No No No  No No No No  Yes (option 2- 16kB Yes (option 4-64kB 
 I-cache I-cache, D -cache) 
Tightly Coupled Memory  No  No  Yes  No  No  No  No  No  Yes
(option 0-16MB
I-TCM/D-TCM) 
TrustZone for Armv8-M
No No No Yes (option)  No  No  Yes (option) Yes (option)  No 
Co-processor interface  No  No  No  No  No  No  Yes (option)  Yes (option)  No 
Bus protocol
AHB Lite  AHB Lite, Fast I/O  AHB Lite  AHB5, Fast I/O  AHB Lite, APB   AHB Lite, APB  AHB5  AHB5 AXI4, AHB Lite, APB, TCM
Wake-up interrupt controller support
Yes Yes  No  Yes  Yes  Yes  Yes  Yes  Yes 
Integrated interrupt controller
Yes  Yes  Yes  Yes  Yes  Yes  Yes Yes  Yes 
Maximum # external interrupts
32  32  32  240  240  240  480 480 240  
Hardware divide  No No  No  Yes  Yes  Yes  Yes  Yes Yes 
Single cycle multiply
Yes (option) Yes (option)  No  Yes  Yes  Yes  Yes  Yes  Yes 
CMSIS Support
Yes  Yes  Yes  Yes  Yes  Yes  Yes  Yes  Yes 
Dual Core Lock-Step Support
Yes  Yes  Yes  Yes  Yes  Yes  Yes  Yes  Yes 

 *See individual Cortex-M product pages for further information.

Get Support

Arm Support

Arm training courses and on-site system-design advisory services enable licensees to efficiently integrate the Cortex-M1 processor into their design to realize maximum system performance with lowest risk and fastest time-to-market.

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Community Forums

Suggested answer Can i change SP at run time in CM33?
  • Arm Development Studio
  • Cortex-M33
  • Armv8-M
0 votes 202 views 3 replies Latest 15 hours ago by Joseph Yiu Answer this
Suggested answer Memory Protection Unit - Complexity in usage 0 votes 520 views 7 replies Latest 17 hours ago by Andy Neil Answer this
Suggested answer Monitor Mode Debug 0 votes 610 views 7 replies Latest 19 hours ago by Andy Neil Answer this
Not answered Audio mixing efficiently and hard realtime requirment
  • algorithms
  • audio
  • Digital Signal Processor (DSP)
  • Cortex-M4
  • STM32 F4
0 votes 70 views 0 replies Started yesterday by Manojkumar Subramaniam Answer this
Not answered Are there any Cortex-M controller with h.264 encoder? 0 votes 67 views 0 replies Started yesterday by Vick Answer this
Answered 32-bit encoding hex values for Arm instructions 0 votes 298 views 3 replies Latest 2 days ago by BQL Answer this
Suggested answer Can i change SP at run time in CM33? Latest 15 hours ago by Joseph Yiu 3 replies 202 views
Suggested answer Memory Protection Unit - Complexity in usage Latest 17 hours ago by Andy Neil 7 replies 520 views
Suggested answer Monitor Mode Debug Latest 19 hours ago by Andy Neil 7 replies 610 views
Not answered Audio mixing efficiently and hard realtime requirment Started yesterday by Manojkumar Subramaniam 0 replies 70 views
Not answered Are there any Cortex-M controller with h.264 encoder? Started yesterday by Vick 0 replies 67 views
Answered 32-bit encoding hex values for Arm instructions Latest 2 days ago by BQL 3 replies 298 views