The Atmel 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 ATmega16A provides the following features: 16Kbytes of In-System Programmable Flash Program
memory with Read-While-Write capabilities; 512bytes EEPROM; 1Kbyte SRAM; 32 general purpose I/O lines,
32 general purpose working registers; a JTAG interface for Boundary-scan; 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.
The device is manufactured using Atmels high density nonvolatile memory technology. The On-chip ISP Flash
allows the program memory to be reprogrammed in-system through an SPI serial interface, by a conventional
nonvolatile memory programmer, or by an On-chip Boot program running on the AVR core. The boot program
can use any interface to download the application program in the Application Flash memory. Software in the
Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-
While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a
monolithic chip, the Atmel ATmega16A is a powerful microcontroller that provides a highly-flexible and cost-
effective solution to many embedded control applications.
The ATmega16A is supported with a full suite of program and system development tools including: C compilers,
macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation kits.
ATmega16A [DATASHEET]
Atmel-8154CS-8-bit-AVR-ATmega16A_Datasheet Summary-07/2014
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MICROCHIP [ MICROCHIP TECHNOLOGY ]
