ATMEGA649V-8AUR
ATMEGA649V-8AUR - 8MHz AVR MCU 64KB Flash LCD | Microchip
The Microchip Technology ATMEGA649V-8AUR is a high-performance, low-power 8-bit AVR RISC microcontroller combining 64KB ISP Flash memory with read-while-write capability, 2KB EEPROM, 4KB SRAM, and 54 general-purpose I/O lines, running at up to 8 MHz and housed in a 64-pin TQFP (14x14 mm) package.
A microcontroller is a single-chip computer that integrates a processor core, program memory, data memory, and peripheral functions such as timers, UARTs, ADCs, and display drivers. The AVR family, originally developed by Atmel and now part of Microchip Technology, popularized the Harvard-architecture RISC design in which most instructions execute in a single clock cycle. Microcontrollers sit at the center of the embedded-system hierarchy, bridging bare logic ICs and full application processors, and are classified as 8-bit, 16-bit, or 32-bit depending on the datapath width.
Key features of the ATMEGA649V-8AUR include the integrated LCD controller supporting up to 132 segments (4x40), which is the defining feature of this ATmega649 variant, plus a JTAG interface for boundary-scan and on-chip debugging, 32 general-purpose working registers, and in-system self-programmable Flash. The V speed grade supports 1.8V to 5.5V operation at up to 8 MHz, making it suitable for battery-powered designs.
Architecturally, the AVR core executes most instructions in a single clock cycle, delivering up to 8 MIPS at 8 MHz. Read-while-write Flash allows firmware updates without halting execution. Peripherals typically include 8/16-bit timers, USART, SPI, TWI (I2C), a 10-bit ADC, and an analog comparator, together with the segment LCD driver that differentiates the 649 from the 640/644/645 family members.
Typical applications include battery-powered utility meters, panel meters with segment LCD displays, industrial handheld instruments, and low-power human-machine interfaces where an integrated LCD driver eliminates an external display controller.
When designing with this device, remember the V variant is limited to 8 MHz; the faster 16 MHz code requires the ATmega649A/649P family at 5V. Verify the LCD bias resistor network and contrast capacitor values against the manufacturer datasheet for the target panel configuration.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
USD $4,88
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