Rainbow Electronics ATtiny43U - Manual (Page 4)

4
8048B–AVR–03/09
ATtiny43U
2. Overview
The ATtiny43U 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 ATtiny43U achieves
throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power con-
sumption versus processing speed.
Figure 2-1. Block Diagram
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
STACK
POINTER
SRAM
PROGRAM
COUNTER
BOOST
CONVERTER
PROGRAMMING
LOGIC
ISP
INTERFACE
INTERNAL
OSCILLATOR
WATCHDOG
TIMER
MCU CONTROL
REGISTER
MCU STATUS
REGISTER
TIMER/
COUNTER0
TIMER/
COUNTER1
CALIBRATED
OSCILLATOR
TIMING AND
CONTROL
INTERRUPT
UNIT
EEPROM
ANALOG
COMPARATOR
ADC
POWER
SUPERVISION
POR
BOD
RESET
ON-CHIP
DEBUG
VOLTAGE
REFERENCE
GENERAL
PURPOSE
REGISTERS
X
Y
Z
ALU
STATUS
REGISTER
PROGRAM
FLASH
INSTRUCTION
REGISTER
INSTRUCTION
DECODER
CONTROL
LINES
DATA REGISTER
PORT A
DIRECTION REG.
PORT A
DRIVERS
PORT A
V
CC
VBAT
LSW
RESET
DATA REGISTER
PORT B
DIRECTION REG.
PORT B
DRIVERS
PORT B
GND
USI
PA7:0 PB7:0