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The NuMicro® M261SIAAE is a low-power microcontroller platform based on Arm® Cortex®-M23 core for Armv8-M architecture. It runs up to 64 MHz with 512 Kbytes embedded Flash memory in dual bank mode supporting Over-The-Air ( OTA ) firmware update and 96 Kbytes embedded SRAM. It also supports low supply voltage from 1.8 ~ 3.6 V and operating temperature range from - 40 ~ + 105 ℃.

Low power and robust security are two major vitals for Internet-of-Things ( IoT ) applications. The NuMicro® M261SIAAE provides multi power modes for diverse operating scenarios, such as Power-down mode ( PD ), Fast Wake-up Power-down mode ( FWPD ), Low Leakage Power-down mode ( LLPD ), Ultra Low Leakage Power-down mode ( ULLPD ), Standby Power-down mode ( SPD ) and Deep Power-down mode ( DPD ). The NuMicro® M261SIAAE also integrates RTC with independent VBAT voltage source pin to support low power mode with main power off and VBAT only. Regarding the power consumption of the NuMicro® M261SIAAE, 97 μA / MHz ( LDO mode ) and 45 μA / MHz ( DC-DC mode ) in normal run mode, 2.8 μA in Standby Power-down mode, and less than 2μA in Deep Power-down mode without VBAT. It’s low power, wide supply voltage and fast wake-up features make it suitable for battery-powered IoT applications.

The NuMicro® M261KIAAE provides secure boot function for a system developer to create a secure execution system in the microcontroller. The secure boot is a chain of secure process for verifying each software identity and integrity on the system. Secure boot can help to make sure that a device boots using only software that is trusted by the original developer. When the MCU starts, the firmware checks the signature of boot software, if the signatures are valid, the MCU boots, and the firmware gives control to the operating system. Otherwise, the system will not run at all.

The NuMicro® M261SIAAE provides 4-region programable eXecute-Only-Memory ( XOM ) to secure critical program codes. The AES 256 / 192 / 128 hardware accelerator and True Random Number Generator ( TRNG ) are built-in for data encryption. One tamper detection pin is implemented to avoid malicious damage from hacker. Accompany with 96-bit Unique Identification ( UID ) and 128-bit Unique Customer Identification ( UCID ) to enhance the product security.

The NuMicro® M261SIAAE integrates Voltage Adjustable Interface ( VAI ), 6 I / O pins to support the 2nd I / O voltage from 1.8 ~ 3.6 V to save level shifter components while connecting to external devices.

The NuMicro® M261SIAAE integrates one set of Secure Digital Host Controllers ( SDHC ), compliant with SD Memory Card Specification Version 2.0. It supports 50 MHz to achieve 200 Mbps at 3.3V operation, and dedicated DMA master with Scatter-Gather function to accelerate the data transfer between system memory and SD / SDHC / SDIO card.

The NuMicro® M261SIAAE is equipped with plenty of peripherals such as Timers, Watchdog Timers, RTC, PDMA, External Bus Interface ( EBI ), Low-power UART, Universal Serial Control Interface ( USCI ), Qual SPI ( QSPI ), SPI/I²S, I²C, Smart Card Interface ( ISO-7816-3 ), GPIOs, 24 channels of PWM, makes it highly suitable for connecting comprehensive external modules and LED lighting control. The NuMicro® M261SIAAE also integrates high performance analog front-end circuit blocks, such as one 16 channels of 12-bit 3.76 MSPS SAR ADC, two 12-bit 1 MSPS voltage type DAC, two rail-to-rail analog comparator ( ACMP ), temperature sensor, low voltage reset ( LVR ) and brown-out detector ( BOD ) to enhance product performance, reduce both external components and form factor.

The package types of NuMicro® M261SIAAE is LQFP64 ( 7 mm x 7 mm ). Pin-to-pin compatible in same package makes optimizing product features and performance easily

Nuvoton NuMaker M261 / M262 / M263 evaluation boards ( NK-M263KI ) and Nu-Link debugger are available for evaluation and product development. 3rd Party IDEs such as Keil MDK, IAR EWARM and NuEclipse IDE with GNU GCC compilers, are also supported.

Target Application:

  • Smart Home / Smart Home Appliance / Smart Door lock
  • Industrial Control / Industrial Automation
  • Smart City Facilities / Security Alarm System
  • IoT Device / Wireless Sensor Node Device / Communication Modules
  • Electronic Payments
  • Portable Wireless Data Collector
  • Handheld Medical Device

Key Features:

Operating Characteristics
  - Voltage range: 1.8 V ~ 3.6 V
  - Temperature range: -40 °C ~ +105 °C
  - Arm® Cortex®-M23 processor, Armv8-M, runs up to 64 MHz
  - 32-bit hardware multiplier / divider
  - 512 KB Flash, dual bank, for OTA upgrade
  - 96 KB SRAM
  - 4 KB LDROM
  - 4 KB Key Protection ROM ( KPROM )
  - 4-region eXecute-Only-Memory ( XOM )
  - Supports Trusted Boot
  - 4 ~ 24 MHz external high speed crystal oscillator ( HXT ) for precise timing operation
  - 32.768 kHz external low speed crystal oscillator ( LXT ) for RTC function and low-power system operation
  - 12 MHz internal high speed RC oscillator ( HIRC ) for system operation ( After auto-trim ± 0.25 % )
  - 48 MHz internal high speed RC oscillator ( HIRC48 ) for system operation ( After auto-trim ± 0.25 % )
  - 10 kHz internal low speed RC oscillator ( LIRC ) for Watchdog Timer and wake-up operation
  - 32 kHz internal low speed RC oscillator ( LIRC32 ) for RTC function
Power management
  - Dual voltage regulator is available for DC-DC converter or LDO
  - Supports 1.2 V and 0.9 V core voltage
  - Supports Power-down mode, Standby Power-down mode, Low Leakage Power-down mode, Ultra Low Leakage Power-down mode, Fast Wake-up Power-down mode, and Deep Power-down mode
  - Supports external power pin VBAT ( Standalone VBAT for RTC power domain )
Low Power Consumption
  - 97 μA / MHz ( LDO ) and 45 μA / MHz ( DC-DC ) in operating mode
  - 2.8 μA in Standby Power-down mode
  - Less than 2 μA in Deep Power-down mode without VBAT
  - 80 bytes of battery-powered backup registers, which can be cleared by tamper pins
  - Supports 1 static and dynamic tamper pin
  - Up to four 32-bit timers
  - 16 channels
  - 24-channels PWM
  - Supports trigger ADC or DAC
  - Supports independent mode for PWM output / Capture input channel
  - Supports complementary mode for 3 complementary paired PWM output channel
  - 16 channels 12-bit 3.76 MSPS ADC
  - 2 sets of rail-to-rail comparators ( ACMP )
  - 2 sets of 12-bit 1 MSPS voltage type DAC
  - Supports external VREF pin or internal reference voltage VREF: 1.6V, 2.0V, 2.5V, and 3.0V
Communication interfaces
  - 6 sets of LPUART interface
  - 3 sets of I²C interface
  - 1 set of QSPI interface
  - 4 set of SPI / I²S interface ( Configured as SPI or I²S )
  - 3 sets of Smart Card Interface ( ISO-7816-3, ISO-7816-3 supports full duplex UART mode )
  - 2 sets of USCI ( Configured as UART, SPI or I²C )
  - 1 set of Secure Digital Host Controllers ( SDHC ), compliant with SD Memory Card Specification Version 2.0
  - 16 / 8-bits EBI ( External Bus Interface ) interface
VAI ( Voltage Adjustable Interface )
  - 6 I / O pins to support the 2nd I / O voltage from 1.8 ~ 3.6V, applied voltage to the VDDIO pin
Utility Support
  - Arm® Keil MDK and IAR EWARM IDE support for debugging
  - Free GNU compiler with NuEclipse IDE support
  - ICP ( In Circuit Programmer ) support for updating internal code via Nu-Link debugger
  - PinView for real time monitor the status of all IO pins
  - PinConfigure tool for pin assignment, initial code generation and OrCAD / Protel part generation
  - ClockConfigure tool for generating the initial source code of system clock
96-bit Unique ID ( UID )
128-bit Unique Customer ID ( UCID )
  - LQFP64 ( 7 mm x 7 mm )

For more details and documents, please link to Nuvoton Official Website GO

Volume discounts

QuantityDiscountYou Save
10023.14%Up to$80.9900
50036%Up to$630.0000
100042%Up to$1,470.0000
Part No.M261SIAAE
Flash (Kbytes)512
SRAM (Kbytes)96
DAC (12-bit)2
ADC (12-bit)16
PackageLQFP 64
ISP Loader ROM(KB)4
16-bit EPWM12
16-bit BPWM12

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