AVR ATmega16 Specifications
The AVR ATmega16 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 AVR ATmega16 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power con- sumption versus processing speed.
The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
The AVR ATmega16 provides the following features:
- 16K bytes of In-System Programmable Flash Program memory with Read-While-Write capabilities,
- 512 bytes EEPROM,
- 1K byte SRAM,
- 32 general purpose I/O lines,
- 32 general purpose working registers,
- a JTAG interface for Boundaryscan,
- On-chip Debugging support and programming,
- three flexible Timer/Counters with compare modes,
- Internal and External Interrupts,
- a serial programmable USART,
- a byte oriented Two-wire Serial Interface,
- an 8-channel, 10-bit ADC with optional differential input stage with programmable gain (TQFP package only),
- a programmable Watchdog Timer with Internal Oscillator,
- an SPI serial port, and
- six software selectable power saving modes.
The Idle mode stops the CPU while allowing the USART, Two-wire interface, A/D Converter, SRAM, Timer/Counters, SPI port, 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 External Interrupt or Hardware Reset. In Power-save mode, the Asynchronous Timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except Asynchronous Timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low-power consumption. In Extended Standby mode, both the main Oscillator and the Asynchronous Timer continue to run.