AT90S2323_2343.PDF

Features

• Utilizes the AVR ® RISC Architecture

• AVR – High-performance and Low-power RISC Architecture

– 118 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General-purpose Working Registers

– Up to 10 MIPS Throughput at 10 MHz

• Data and Nonvolatile Program Memory

– 2K Bytes of In-System Programmable Flash

Endurance: 1,000 Write/Erase Cycles

– 128 Bytes Internal RAM

– 128 Bytes of In-System Programmable EEPROM

Endurance: 100,000 Write/Erase Cycles

– Programming Lock for Flash Program and EEPROM Data Security

• Peripheral Features

– One 8-bit Timer/Counter with Separate Prescaler

– Programmable Watchdog Timer with On-chip Oscillator

– SPI Serial Interface for In-System Programming

• Special Microcontroller Features

– Low-power Idle and Power-down Modes

– External and Internal Interrupt Sources

– Power-on Reset Circuit

– Selectable On-chip RC Oscillator

• Specifications

– Low-power, High-speed CMOS Process Technology

– Fully Static Operation

• Power Consumption at 4 MHz, 3V, 25 ° C

– Active: 2.4 mA

– Idle Mode: 0.5 mA

– Power-down Mode: <1 µA

• I/O and Packages

– Three Programmable I/O Lines (AT90S/LS2323)

– Five Programmable I/O Lines (AT90S/LS2343)

– 8-pin PDIP and SOIC

• Operating Voltages

– 4.0 - 6.0V (AT90S2323/AT90S2343)

– 2.7 - 6.0V (AT90LS2323/AT90LS2343)

• Speed Grades

– 0 - 10 MHz (AT90S2323/AT90S2343)

– 0 - 4 MHz (AT90LS2323/AT90LS2343)

8-bit

Microcontroller

with 2K Bytes of

In-System

Programmable

Flash

AT90S2323

AT90LS2323

AT90S2343

AT90LS2343

Description

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.

(continued)

Pin Configuration

PDIP/SOIC

RESET

(CLOCK) PB3

PB4

GND

VCC

PB2 (SCK/T0)

PB1 (MISO/INT0)

PB0 (MOSI)

RESET

XTAL1

XTAL2

GND

VCC

PB2 (SCK/T0)

PB1 (MISO/INT0)

PB0 (MOSI)

Rev. 1004C–10/00

AT90S/LS2343

AT90S/LS2323

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 conventional CISC microcontrollers.

Block Diagram

Figure 1. The AT90S/LS2343 Block Diagram

VCC

8-BIT DATA BUS

INTERNAL

OSCILLATOR

GND

PROGRAM

COUNTER

STACK

POINTER

WATCHDOG

TIMER

TIMING AND

CONTROL

RESET

PROGRAM

FLASH

SRAM

MCU CONTROL

INSTRUCTION

GENERAL

PURPOSE

REGISTERS

TIMER/

COUNTER

INSTRUCTION

DECODER

INTERRUPT

UNIT

CONTROL

LINES

ALU

EEPROM

STATUS

PROGRAMMING

LOGIC

SPI

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

PORTB DRIVERS

PB0 - PB4

AT90S2323/LS2323 and AT90S2343/LS2343

AT90S2323/LS2323 and AT90S2343/LS2343

Figure 2. The AT90S/LS2323 Block Diagram

VCC

8-BIT DATA BUS

INTERNAL

OSCILLATOR

GND

PROGRAM

COUNTER

STACK

POINTER

WATCHDOG

TIMER

TIMING AND

CONTROL

RESET

PROGRAM

FLASH

SRAM

MCU CONTROL

INSTRUCTION

GENERAL

PURPOSE

REGISTERS

TIMER/

COUNTER

INSTRUCTION

DECODER

INTERRUPT

UNIT

CONTROL

LINES

ALU

EEPROM

STATUS

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 Programmable 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 pro-

gram memory to be reprogrammed in-system through an SPI serial interface. By combining an 8-bit RISC CPU with ISP

Flash on a monolithic chip, the Atmel AT90S2323/2343 is a powerful microcontroller that provides a highly flexible and

cost-effective solution to many embedded control applications.

The AT90S2323/2343 AVR is supported with a full suite of program and system development tools including: C compilers,

macro assemblers, program debugger/simulators, in-circuit emulators and evaluation kits.

Comparison between AT90S/LS2323 and AT90S/LS2343

The AT90S/LS2323 is intended for use with external quartz crystal or ceramic resonator as the clock source. The start-up

time is fuse-selectable as either 1 ms (suitable for ceramic resonator) or 16 ms (suitable for crystal). The device has three

I/O pins.

The AT90S/LS2343 is intended for use with either an external clock source or the internal RC oscillator as clock source.

The device has five I/O pins.

Table 1 summarizes the differences in features of the two devices.

Table 1. Feature Difference Summary

Part

AT90S/LS2323

AT90S/LS2343

On-chip Oscillator Amplifier

yes

Internal RC Clock

yes

PB3 available as I/O pin

never

internal clock mode

PB4 available as I/O pin

never

always

Start-up time

1 ms/16 ms

16 µs fixed

Pin Descriptions AT90S/LS2323

VCC

Supply voltage pin.

GND

Ground pin.

Port B (PB2..PB0)

Port B is a 3-bit bi-directional I/O port with internal pull-up resistors. The Port B output buffers can sink 20 mA. As inputs,

Port B pins that are externally pulled low will source current if the pull-up resistors are activated.

Port B also serves the functions of various special features.

Port pins can provide internal pull-up resistors (selected for each bit). The Port B pins are tri-stated when a reset condition

becomes active.

RESET

Reset input. An external reset is generated by a low level on the RESET pin. Reset pulses longer than 50 ns will generate

a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.

XTAL1

Input to the inverting oscillator amplifier and input to the internal clock operating circuit.

XTAL2

Output from the inverting oscillator amplifier.

AT90S2323/LS2323 and AT90S2343/LS2343

AT90S2323/LS2323 and AT90S2343/LS2343

Pin Descriptions AT90S/LS2343

VCC

Supply voltage pin.

GND

Ground pin.

Port B (PB4..PB0)

Port B is a 5-bit bi-directional I/O port with internal pull-up resistors. The Port B output buffers can sink 20 mA. As inputs,

Port B pins that are externally pulled low will source current if the pull-up resistors are activated.

Port B also serves the functions of various special features.

Port pins can provide internal pull-up resistors (selected for each bit). The Port B pins are tri-stated when a reset condition

becomes active.

RESET

Reset input. An external reset is generated by a low level on the RESET pin. Reset pulses longer than 50 ns will generate

a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.

CLOCK

Clock signal input in external clock mode.

Clock Options

Crystal Oscillator

The AT90S/LS2323 contains an inverting amplifier that can be configured for use as an on-chip oscillator, as shown in

Figure 3. XTAL1 and XTAL2 are input and output respectively. Either a quartz crystal or a ceramic resonator may be used.

It is recommended that the AT90S/LS2343 be used if an external clock source is used, since this gives an extra I/O pin.

Figure 3. Oscillator Connection

External Clock

The AT90S/LS2343 can be clocked by an external clock signal, as shown in Figure 4, or by the on-chip RC oscillator. This

RC oscillator runs at a nominal frequency of 1 MHz (V CC = 5V). A fuse bit (RCEN) in the Flash memory selects the on-chip

RC oscillator as the clock source when programmed (“0”). The AT90S/LS2343 is shipped with this bit programmed. The

AT90S/LS2343 is recommended if an external clock source is used, because this gives an extra I/O pin.

The AT90S/LS2323 can be clocked by an external clock as well, as shown in Figure 4. No fuse bit selects the clock source

for AT90S/LS2323.

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