AT90LS2323 データシートの表示（PDF） - Atmel Corporation

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AT90LS2323

8-bit AVR® Microcontroller with 2K Bytes of In-System Programmable Flash

Atmel Corporation 

Description

Block Diagram

The AT90S/LS2323 and AT90S/LS2343 are low-power, CMOS, 8-bit microcontrollers

based on the AVR RISC architecture. By executing powerful instructions in a single

clock cycle, the AT90S2323/2343 achieves throughputs approaching 1 MIPS per MHz

allowing the system designer to optimize power consumption versus processing speed.

The AVR core combines a rich instruction set with 32 general-purpose working regis-

ters. 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.

Figure 1. The AT90S/LS2343 Block Diagram

VCC

GND

PROGRAM

COUNTER

8-BIT DATA BUS

INTERNAL

OSCILLATOR

STACK

POINTER

WATCHDOG

TIMER

TIMING AND

CONTROL

RESET

PROGRAM

FLASH

SRAM

MCU CONTROL

REGISTER

INSTRUCTION

REGISTER

INSTRUCTION

DECODER

CONTROL

LINES

GENERAL

PURPOSE

REGISTERS

X

Y

Z

ALU

TIMER/

COUNTER

INTERRUPT

UNIT

EEPROM

STATUS

REGISTER

PROGRAMMING

LOGIC

SPI

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

PORTB DRIVERS

PB0 - PB4

2 AT90S/LS2323/2343

1004D–09/01

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