AVR stand for Alf Vegard RISC is a modified Harvard architecture, 8-bit RISC, single chip microcontroller which was designed by Norwegian Institutte of Technology, Alf-Egil Bogen and Vegard wollan and then was developed by Atmel in 1996.. The AVR was one of the first microcontroller families to use on-chip flash memory for program storage.
Port A serves as the analog inputs to the A/D Converter. Port A also serves as an 8-bit bi-directional I/O port, if the A/D Converter is not used. Port pins. Port pins metrical drive characteristics with both high sink and source capability. When pins PA0 to PA7 are used as inputs and are externally pulled low, they will source current if the internal pull-up. Reset Input. A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running. The minimum pulse length is given in Shorter pulses are not guaranteed to generate a reset.
Features of ATmega32 Microcontroller
- 32K bytes of In-System Programmable Flash Program memory with Read-While-Write capabilities
- 1024 bytes EEPROM
- 2K byte SRAM
- 32 general purpose I/O lines
- JTAG interface for Boundary scan
- On-chip Debugging support and programming
- 3 flexible Timer/Counters with compare modes
- Internal and External Interrupts
- Serial programmable USART
- Byte oriented Two-wire Serial Interface ( I2C )
- 8-channel, 10-bit ADC
- Programmable Watchdog Timer with Internal Oscillator
- SPI serial port
- 6 software selectable power saving modes