The NuMicro® ML51 low-power series is an enhanced 1T 8051 core microcontroller with built-in Flash. The typical power consumption in normal operation mode can reach 80 μA / MHz and the power consumption in sleep mode can be less than 1 μA. This series has a maximum speed of up to 24 MHz, and a built-in 38.4 kHz low-speed internal oscillator, supporting a wide voltage operating range of 1.8 V to 5.5 V, operating temperature:-40 ℃ to 105 ℃.

NuMicro® ML51 series is not only low-power but also rich in many features such as 12-bit 500 KSPS SAR ADC and up to two sets of comparators, built-in fourth-order reference voltage for ADC and ACMP, and built-in DMA acceleration data To reduce the burden on the CPU. In addition, NuMicro® ML51 series contains highly integrated peripherals such as two serial ports, two smart card interfaces, two I²C and two SPI.

NuMicro® ML51 has built-in 16 KB ~ 64 KB Flash memory and 1 ~ 4 KB SRAM. Pins from 10 to 64 are available in a variety of packages, and are compatible with 32-bit microcontrollers with the same package pins, making selection and upgrading more convenient.

Target application:Wearable devices, home automation, Internet of Things devices, fire smoke detection, battery management, remote control, wireless charging, etc.

Main features

• CPU
 -Fully static 8-bit 1T 8051 core CMOS microcontroller
 -The instruction set is fully compatible with MCS-51
 -4-level priority interrupt configuration
 -Dual data pointers (DPTRs)

• Working conditions
 -Wide voltage operating range 1.8V to 5.5V
 -Wide operating frequency up to 24 MHz
 -Industrial grade operating temperature-40 ℃ to + 105 ℃

• Low power consumption
 -Typical power consumption in normal operation mode 80 μA / MHz
 -Typical power consumption of low power operation mode 15 μA
 -Low power consumption in idle mode does not exceed 13 μA
 -Typical power consumption in power-down mode is less than 1 μA
 -Wake-up time in power-down mode is 10 us (HIRC operation)

• RAM
 -Up to 64/32/16/8 K bytes APROM for user code
 -Configurable 4 K / 3 K / 2 K / 1 K byte LDROM, used to start system programming (ISP) code
 -APROM application programming (IAP) memory 128 bytes without page accumulation
 -100,000 times flash memory life
 -Code security encryption
 -256 bytes of on-chip RAM
 -Extra 4/2/1 K bytes of on-chip auxiliary RAM (XRAM), accessed via MOVX instruction

• PDMA
 -Three modes: external device to memory, memory to external device and memory to memory transfer
 -Source and destination addresses must be word aligned in all modes
 -Memory to memory mode: transfer length must be word aligned
 -External device to memory and memory to external device modes: the length of the transferred data can be byte aligned
 -External device to memory and memory to external device modes: transfer data width byte alignment

• Clock source
 -24 MHz high-speed internal oscillator (HIRC) ± 1% accuracy class (25 ° C, 3.3V) accuracy ± 5% accuracy class over    full operating conditions
 -38.4 kHz low-speed internal oscillator (LIRC) ± 1% accuracy class (25 ° C, 3.3) accuracy ± 10% accuracy class over    full operating conditions
 -External 4 ~ 24 MHz (HXT) crystal oscillator input for precise timing operation
 -External 32.768 kHz (LXT) crystal input
 -The clock source can be switched by software during operation
 -Programmable system clock divider from 1/2, 1/4, 1/6, 1/8…, up to 1/512

• Peripherals
 -Up to 56 general purpose input and output pins. All output pins have independent 2-level level conversion rate control
 -8-channel GPIO interrupt, with edge / level detection, all 56 GPIOs can be configured as one of the input sources
 -Standard interrupt pin and compatible standard 8051
 -Two sets of 16-bit timer / counters 0 and 1 compatible with standard 8051
 -A set of 16-bit timer 2 with 3-channel input capture module
 -A set of 16-bit auto-reload timer 3, which can be used as the baud rate clock source for UARTs
 -A set of programmable watchdog timer (WDT) is clocked by a dedicated 38.4 kHz LIRC
 -A set of dedicated self-wake timer (WKT) is used to save power for the self-timer wake-up function, and the clock source    is provided by 38.4 kHz LIRC or 32.768 kHz LXT
 -Two full-duplex serial ports with frame error detection and automatic address recognition. TXD and RXD pins can be    replaced by software
 -Two sets of smart card interfaces support ISO7816-3 compatible T = 0, T = 1 and support full-duplex UART mode
 -Two sets of SPI ports support master and slave modes, when the system clock is 24 MHz, the transmission rate is up to 6    Mbps
 -Two sets of I²C bus support master and slave mode, data transfer rate up to 400 kpbs
 -6 groups, 12-channel pulse width modulator (PWM) output, up to 16-bit resolution, providing different modes and fault    braking functions for motor control. 16-bit PWM counter used as an independent timer with interrupt
 -Two sets of comparators support hysteresis function
 -A set of 12-bit ADC, when VDD is greater than 2.5 V, the conversion rate is up to 500 Ksps, hardware trigger and    conversion results are more convenient for motor control
 
• Power monitor
 -Undervoltage detection (BOD) can be used in low power consumption mode, 7 levels are selectable, configurable interrupt    or reset
 -Power-on reset (POR)
 -Low voltage reset (LVR)
 
• Powerful ESD and EFT capabilities
 -ESD HBM passes 8 kV
 -EFT> ± 4.4 kV
 -Latch test passed 150 mA
 
•Development tools
 -Nuvoton Nu-Link based on KEILTM and IAR development environment
 -Nuvoton circuit programming (Nu-Link)

 -Nuvoton in-system programming (ISP) via UART

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