Part Number: ATTINY44A-SSU

Manufacturer: Microchip Technology

Description: IC MCU 8BIT 4KB FLASH 14SOIC

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Technical Specifications of ATTINY44A-SSU

Datasheet  ATTINY44A-SSU datasheet
Category Integrated Circuits (ICs)
Family Embedded – Microcontrollers
Manufacturer Atmel
Series AVR? ATtiny
Packaging Tube
Part Status Active
Core Processor AVR
Core Size 8-Bit
Speed 20MHz
Connectivity USI
Peripherals Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number of I/O 12
Program Memory Size 4KB (2K x 16)
Program Memory Type FLASH
EEPROM Size 256 x 8
RAM Size 256 x 8
Voltage – Supply (Vcc/Vdd) 1.8 V ~ 5.5 V
Data Converters A/D 8x10b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 14-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 14-SOIC

ATTINY44A-SSU Description

The high-performance Microchip picoPower® 8-bit AVR® RISC-based microcontroller is a robust device with many features and functionalities. The microcontroller provides a strong solution for many applications thanks to its 4 KB ISP Flash memory, 12 general-purpose I/O lines, 256B EEPROM, 256B SRAM, and 32 general-purpose working registers.

The device has four software-selectable power-saving modes, an 8-channel 10-bit A/D converter, a programmable watchdog timer with an internal oscillator, and an internally calibrated oscillator. The device’s 1.8 to 5.5 volts voltage provides exceptional flexibility and compatibility with various power sources.

With throughputs nearing one MIPS per MHz while balancing power consumption and processing speed, this microcontroller stands out for its capacity to carry out powerful instructions in a single clock cycle. It is, therefore, the best option for applications where power consumption is crucial.

The Microchip picoPower® 8-bit AVR® RISC-based microcontroller is a great choice for a dependable, high-performance microcontroller. CPU Core

The CPU core’s primary duty is to guarantee proper program execution. As a result, the CPU must possess the skills necessary to conduct calculations, access memories, manage interrupts, and operate peripherals.

● ALU – Arithmetic Logic Unit

All 32 general-purpose working registers directly communicate with the high-performance AVR ALU throughout the operation. A single clock cycle can perform arithmetic operations between general-purpose registers or between a register and an instant. Arithmetic, logic, and bit-functions are the three primary divisions of ALU operations. Some architecture implementations also offer a potent multiplier that supports both signed/unsigned multiplication and fractional format.

● Stack Pointer

The Stack mostly stores temporary data, local variables, and return addresses following interruptions and calls to subroutines. The Stack Pointer Register always points at the top of the stack. Remember that the Stack is designed to develop from higher to lower memory locations. This suggests that a Stack PUSH operation decreases the Stack Pointer. The Subroutine and Interrupt Stacks are placed in the data SRAM Stack section, where the Stack Pointer points. Before any subroutine calls or interrupts are enabled, the software must define this Stack space in the data SRAM.

The Stack Pointer needs to be raised above 0x60. When data is pushed onto the stack using the PUSH instruction and when the return address is loaded onto the stack using a subroutine call or interrupt, the Stack Pointer is decremented by one and two, respectively. When data is removed from the stack using the POP instruction or the return from subroutine RET or interrupt RETI, the stack pointer increases by one and two, respectively. The AVR Stack Pointer is implemented in the I/O area as two 8-bit registers.

Implementation determines how many bits are really used. It should be noted that in some AVR architecture implementations, the data space is so limited that only SPL is required. The SPH Register won’t be present in this scenario.

● Memories

The AVR architecture has two primary memory areas: the Data memory and the Program memory space. The ATtiny24A/44A/84A has an EEPROM Memory for storing data. Each of the three memory regions is linear and regular.

● I/O Memory

The I/O area contains all the peripherals and I/Os for the ATtiny24A/44A/84A. The 32 general-purpose working registers and the I/O space can both be accessed via the LD/LDS/LDD and ST/STS/STD instructions, which can also transfer data between them. The SBI and CBI instructions provide direct bit access to I/O Registers in the 0x00 to 0x1F address range. The SBIS and SBIC instructions can be used in these registers to determine the value of single bits. For more information, see the section on the instruction set. It is necessary to utilize the I/O addresses 0x00 – 0x3F when utilizing the I/O-specific commands IN and OUT.

I/O Registers must be added to these addresses with the value 0x20 when using the LD and ST instructions to address them as data space. Reserved bits should be zero if accessed to ensure compatibility with future devices. Never write to reserved I/O memory addresses. By adding a logical one to certain Status Flags, you can clear them. CBI and SBI instructions can be used on registers holding such Status Flags because they only operate on the specified bit. The only registers that the CBI and SBI commands support are 0x00 through 0x1F.

● Clock Output Buffer

The device can use the CKOUT pin to output the system clock. The CKOUT fuse needs to be set to enable the output. This mode is appropriate when the chip clock is used to drive other system circuits. Remember that during reset, the clock will not be output and that programming the fuse will override the I/O pin’s default behavior. When the clock is output on CKOUT, any clock source, including the built-in RC oscillator, can be chosen. The divided system clock is output if the system clock prescaler is employed.

● Power Management and Sleep Modes

The AVR microcontrollers are perfect for low-power applications due to their strong performance and industry-leading coding efficiency. Additionally, sleep modes let applications turn off inactive MCU modules to conserve power. The AVR offers several sleep modes that let the user adjust the power consumption to the application’s needs.

● I/O Ports

As standard digital I/O ports, all AVR ports offer complete Read-Modify-Write capabilities. This means that with the SBI and CBI commands, it is possible to change the direction of one port pin without mistakenly changing the orientation of any other pins. Changing the drive value (if designed as an output) or turning on or off pull-up resistors (if set up as an input) has the same effects. With strong sink and source capabilities and symmetrical driving characteristics, each output buffer is. The pin driver is powerful enough to directly drive LED displays. A supply-voltage invariant pull-up resistor is available for each port pin and is separately adjustable.


In summary, the ATTINY44A-SSU AVR microcontroller is a useful component integrated into contemporary electronics. Its compact size, low power usage, and extensive feature set make it a desirable alternative for various applications, from consumer electronics to industrial control systems.

The ATTINY44A-SSU provides a flexible and effective solution with amazing characteristics like a 20MHz clock speed, 4KB of Flash memory, 256 bytes of SRAM, and 14 I/O ports. It can also work on a broad voltage range of 1.8V to 5.5V.

When employing the ATTINY44A-SSU, however, designers must consider some aspects, including the choice of the clock source, the power supply, and the programming possibilities. They can guarantee the device’s optimum performance and dependability by taking these elements into consideration.

The Microchip picoPower® microcontroller is available at competitive prices from ICRFQ, and our staff is always on hand to answer questions and process orders. So, don’t hesitate to contact us if you need help getting the Microchip picoPower® microcontroller or any other electronic component.

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