ATmega48/88/168
Overview
The ATmega48/88/168 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 ATmega48/88/168 achieves throughputs approaching 1 MIPS per MHz allowing the
system designer to optimize power consumption versus processing speed.
Figure 2.
Block Diagram
GND
VCC
Block Diagram
Watchdog
Timer
Watchdog
Oscillator
Power
Supervision
POR / BOD &
RESET
debugWIRE
PROGRAM
LOGIC
Oscillator
Circuits /
Clock
Generation
Flash
SRAM
CPU
EEPROM
AVCC
AREF
GND
8bit T/C 0
16bit T/C 1
A/D Conv.
2
DATABUS
8bit T/C 2
Analog
Comp.
Internal
Bandgap
6
USART 0
SPI
TWI
PORT D (8)
PORT B (8)
PORT C (7)
RESET
XTAL[1..2]
PD[0..7]
PB[0..7]
PC[0..6]
ADC[6..7]
3
2545D–AVR–07/04
ATMEL [ ATMEL CORPORATION ]
