2. Overview
The ATmega16/32/64/M1/C1 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
ATmega16/32/64/M1/C1 achieves throughputs approaching 1 MIPS per MHz allowing the sys-
tem designer to optimize power consumption versus processing speed.
2.1
Block Diagram
Figure 2-1.
Block Diagram
Data Bus 8-bit
Flash Program
Memory
Program
Counter
Status
and Control
Interrupt
Unit
SPI
Unit
Instruction
Register
32 x 8
General
Purpose
Registrers
Watchdog
Timer
4 Analog
Comparators
Indirect Addressing
Instruction
Decoder
Direct Addressing
ALU
HW LIN/UART
Control Lines
Timer 0
Timer 1
Data
SRAM
ADC
EEPROM
DAC
I/O Lines
MPSC
Current Source
CAN
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 con-
ventional CISC microcontrollers.
8
Atmel ATmega16/32/64/M1/C1
7647ES–AVR–07/12
ATMEL [ ATMEL CORPORATION ]
