ATTINY85-20SI Atmel, ATTINY85-20SI Datasheet - Page 4

• Manufacturer Part Number: ATTINY85-20SI
• Description: IC AVR MCU 8K 20MHZ 8SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY85-20SI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2. Overview
2.1
4
Block Diagram
ATtiny25/45/85
The ATtiny25/45/85 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced
RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny25/45/85
achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize
power consumption versus processing speed.
Figure 2-1.
The AVR core combines a rich instruction set with 32 general purpose working registers. All 32
registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent
VCC
GND
PROGRAMMING
INSTRUCTION
INSTRUCTION
PROGRAM
PROGRAM
COUNTER
CONTROL
Block Diagram
REGISTER
DECODER
FLASH
LINES
LOGIC
POINTER
REGISTER
REGISTERS
GENERAL
PURPOSE
STATUS
STACK
SRAM
ALU
X
Y
Z
DATA REGISTER
PORT B
8-BIT DATABUS
PORT B DRIVERS
PB[0:5]
REG.PORT B
DATA DIR.
MCU CONTROL
MCU STATUS
WATCHDOG
INTERFACE
UNIVERSAL
INTERRUPT
REGISTER
REGISTER
COUNTER0
COUNTER1
EEPROM
TIMER/
TIMER/
SERIAL
TIMER
DATA
UNIT
ANALOG COMPARATOR
ADC /
OSCILLATOR
TIMING AND
CALIBRATED
OSCILLATORS
CONTROL
INTERNAL
RESET
2586M–AVR–07/10