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The ATTINY84A-MMHR is a microcontroller from ATMEL (now part of Microchip Technology). Below are its specifications, descriptions, and features:

Specifications:

• Manufacturer: ATMEL
• Series: ATtiny
• Core Processor: AVR
• Core Size: 8-bit
• Speed: 20MHz
• Program Memory Size: 8KB (4K x 16) Flash
• RAM Size: 512B SRAM
• EEPROM Size: 512B
• I/O Pins: 12
• Peripherals:
• Analog Comparators
• PWM Channels
• Timer/Counter (2 x 8-bit, 1 x 16-bit)
• USI (Universal Serial Interface)
• 10-bit ADC (8 channels)
• Voltage Range: 1.8V to 5.5V
• Operating Temperature: -40°C to +85°C
• Package: 20-VQFN (4x4)
• Package / Case: 20-VFQFN Exposed Pad

Descriptions:

The ATTINY84A-MMHR is a low-power, high-performance 8-bit AVR microcontroller based on the RISC architecture. It features 8KB Flash memory, 512B SRAM, and 512B EEPROM, making it suitable for embedded control applications. It operates at 20MHz and supports a wide voltage range (1.8V–5.5V).

Features:

• Advanced RISC Architecture (131 instructions, mostly single-clock execution)
• Low Power Consumption (Active mode: 300µA at 1MHz, 1.8V)
• High Endurance Non-Volatile Memory (10,000 write/erase cycles)
• In-System Programmable (ISP) Flash Memory
• 10-bit ADC (8 channels) for analog signal processing
• Two 8-bit & One 16-bit Timer/Counter with PWM support
• Universal Serial Interface (USI) for SPI, I2C, and UART communication
• Internal & External Interrupt Sources
• Watchdog Timer (WDT) with Separate On-chip Oscillator
• Programmable Brown-out Detection (BOD)

This microcontroller is commonly used in battery-powered devices, sensor nodes, and small embedded systems due to its compact size and low power consumption.