ATTINY28L-4AI Atmel, ATTINY28L-4AI Datasheet - Page 2

• Manufacturer Part Number: ATTINY28L-4AI
• Description: IC AVR MCU 2KFLSH 4MHZ 3V 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY28L-4AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Ram Size: -
• Data Converters: -
• Connectivity: -

Description
Block Diagram
2
ATtiny28L/V
The ATtiny28 is a low-power CMOS 8-bit microcontroller based on the AVR RISC archi-
tecture. By executing powerful instructions in a single clock cycle, the ATtiny28 achieves
throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize
power consumption versus processing speed. The AVR core combines a rich instruction
set with 32 general-purpose working registers. All the 32 registers are directly con-
nected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be
accessed in one single instruction executed in one clock cycle. The resulting architec-
ture is more code efficient while achieving throughputs up to ten times faster than
conventional CISC microcontrollers.
Figure 1. The ATtiny28 Block Diagram
The ATtiny28 provides the following features: 2K bytes of Flash, 11 general-purpose I/O
lines, 8 input lines, a high-current LED driver, 32 general-purpose working registers, an
8-bit timer/counter, internal and external interrupts, programmable Watchdog Timer with
internal oscillator and 2 software-selectable power-saving modes. The Idle Mode stops
the CPU while allowing the timer/counter and interrupt system to continue functioning.
The Power-down mode saves the register contents but freezes the oscillator, disabling
all other chip functions until the next interrupt or hardware reset. The wake-up or inter-
GND
VCC
PROGRAMMING
INSTRUCTION
INSTRUCTION
CONTROL
PROGRAM
COUNTER
PROGRAM
REGISTER
DECODER
LINES
FLASH
LOGIC
DATA REGISTER
PORTB
PORTB
HARDWARE
REGISTERS
REGISTER
GENERAL
PURPOSE
POINTER
STATUS
STACK
STACK
ALU
Z
8-BIT DATA BUS
DATA REGISTER
PORTD
MCU CONTROL
OSCILLATOR
WATCHDOG
INTERRUPT
COUNTER
REGISTER
INTERNAL
TIMER/
TIMER
UNIT
PORTD
XTAL1
REG. PORTD
DATA DIR
OSCILLATOR
TIMING AND
CONTROL
XTAL2
DATA REGISTER
CALIBRATED
OSCILLATOR
PORTA
INTERNAL
MODULATOR
PORTA
HARDWARE
PORTA CONTROL
REGISTER
1062FS–AVR–07/06
RESET