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AT90S2343

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

Atmel Corporation 

1004D–09/01

AT90S/LS2323/2343

Figure 2. The AT90S/LS2323 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

OSCILLATOR

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

PORTB DRIVERS

PB0 - PB2

The AT90S2323/2343 provides the following features: 2K bytes of In-System Program-

mable Flash, 128 bytes EEPROM, 128 bytes SRAM, 3 (AT90S/LS2323)/5

(AT90S/LS2343) general-purpose I/O lines, 32 general-purpose working registers, an 8-

bit timer/counter, internal and external interrupts, programmable Watchdog Timer with

internal oscillator, an SPI serial port for Flash Memory downloading and two software-

selectable power-saving modes. The Idle mode stops the CPU while allowing the

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 interrupt or hardware reset.

The device is manufactured using Atmel’s high-density nonvolatile memory technology.

The On-chip Flash allows the program memory to be reprogrammed in-system through

an SPI serial interface. By combining an 8-bit RISC CPU with ISP Flash on a monolithic

3

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