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FM0+ 32-bit ARM® Cortex®-M0+ Microcontroller (MCU) Families | Cypress Semiconductor

FM0+ 32-bit ARM® Cortex®-M0+ Microcontroller (MCU) Families

The FM0+ portfolio of Flexible Microcontrollers are the industry's most energy-efficient 32-bit ARM® Cortex®-M0+ based MCUs. This portfolio of MCUs is designed for ultra-low-power and cost-sensitive applications such as white goods, sensors, meters, HMI systems, power tools and Internet of Things (IoT) battery-powered or wearable devices. These microcontrollers can be easily embedded into systems adopting 8-, 16- or 32-bit MCUs, accelerating product development and reducing development costs.

Performance and Energy Savings

The MCUs are based on the ARM® Cortex®-M0+ core, the most energy-efficient ARM processor available today. The optimized processing and flash architecture of the FM0+ family make it the industry's most energy-efficient Cortex-M0+ MCUs, achieving an industry-leading 35µA/CoreMark® score. The S6E1C-Series consumes only 40µA/MHz in Active mode, where the S6E1B-Series feature an ultra-low-power 0.6µA Standby mode.

Ultra Low Power

The devices in the ultra-low-power group have an operating voltage range of 1.65V to 3.6V, and a maximum CPU clock frequency of 40MHz, Active mode current of 40μA/MHz and an RTC standby mode current of 0.6μA. The devices also feature a segment LCD controller and set of analog peripherals. The products are available with pin counts ranging from 32 to 120.

High Performance Flash Memory

Memory densities range from 56KB to 560KB Flash and up to 64KB RAM - typically found only in MCUs with larger Cortex-M3/M4 cores. The flash memory features a true zero-wait-state operation at full CPU speed and data retention of up to 20 years.

Other Major Features

A simplified bus matrix reduces power consumption. The devices also include local clock gating for each peripheral, a separated clock divider for the CPU and peripherals, low pin counts, and low memory density. The FM0+ MCUs feature Full-Speed USB2.0 Host and Device capabilities, and also offer multiple serial communication interfaces and AES encryption.

Function Differences between each FM0+ by Series

Series S6E1B S6E1C S6E1A
Flash/SRAM(KB) 512/64 128/16 88/6
Work Flash (KB) 48 - -
GPIO 103 54 37
Base Timer 8 8 4
MFT 1 - 1
QPRC - - 1
MFS 8 6 3
USB 1 1 -
HDMI-CEC 2 2 -
DMA/DSTC -/64 -/64 2/-
ADC 24 8 8
I2S 2 2 -

44SEG x 4COM or

40SEG x 8COM (Max)

- -
Smart Card Interface 2 1 -


A 40MHz ARM® Cortex®-M0+ MCU, featuring up to 560KB Flash and 102 GPIO - the industry's largest memory and IO footprint for a Cortex®-M0+ based microcontroller, for secure and reliable M2M...
A 40MHz ARM® Cortex®-M0+ MCU, featuring up to 128KB Flash and 54 GPIO - with an industry-leading 35µA/CoreMark® score for ultra-low-power applications
A 40MHz ARM® Cortex®-M0+ MCU,  featuring up to 88KB Flash and robust 2.7 - 5.5V operating voltage range for industrial applications
FM0+ Datasheets
  • The FM0+ datasheets is intended to provide quick reference on the specific FM0+ device series.
FM0+ Flash Specifications
  • Flash Programming Manual explains the functions, operations and serial programming of the flash memory for FM0+ devices. This manual is intended for engineers engaged in the actual development of products using the FM0+ devices. 
FM0+ Technical Reference Manual
  • The FM0+ Technical Reference Manual provides detailed information on the device features and how they work. It is intended for advance user's who want to understand what's going on under the hood.
Application Notes


Peripheral Driver Library

FM MCU Peripheral Driver Library (PDL)

The FM MCU Peripheral Driver Library (PDL) simplifies software development for the FM0+, FM3, and FM4 MCU families. The PDL reduces the need to understand register usage and bit structures, thus easing software development for the extensive set of peripherals in the FM families. You configure the library for the particular device, and then use API calls to initialize and use a peripheral. Using the PDL makes it easier to port code from one family to the other, because the same code supports all FM families.


Support Tools

Vendor Link Comments
IAR Systems!?architecture=ARM IAR Embedded Workbench for ARM 7.50.2 or later
ARM Keil Keil Embedded Development Tools for ARM 5.17 or later
GCC ARM Embedded GCC ARM Embedded 4.9-2015-q1-update or later
Atollic Atollic TrueSTUDIO v5.5.2 or later
iSystem iSYSTEM winIDEA 9.12 or later



Click on the link below to download the tool

Product Description
Pin and Code Wizard Tool that helps set the IO ports for Cypress's 32-bit ARM Cortex FM MCUs
Serial Port Viewer Tool Tool that is used to monitor all available com ports and provides a terminal emulator
CMSIS-DAP USB Drivers CMSIS-DAP is the interface firmware for a Debug Unit that connects the Debug Port to USB. Debuggers, which execute on a host computer, connect via USB to the Debug Unit and to the Device that runs the application software
FLASH Programmer Tool that converts RS232C data to readable data on your PC
USB Wizard Tools that supports editing USB descriptors and templates