AT90LS2343-4 查看數據表（PDF） - Atmel Corporation

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AT90LS2343-4

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

Atmel Corporation 

Comparison between

AT90S/LS2323 and

AT90S/LS2343

Pin Descriptions

AT90S/LS2323

VCC

GND

Port B (PB2..PB0)

RESET

XTAL1

XTAL2

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 devel-

opment tools including: C compilers, macro assemblers, program debugger/simulators,

in-circuit emulators and evaluation kits.

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 inter-

nal 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

On-chip Oscillator Amplifier

yes

Internal RC Clock

no

PB3 available as I/O pin

never

PB4 available as I/O pin

never

Start-up time

1 ms/16 ms

AT90S/LS2343

no

yes

internal clock mode

always

16 µs fixed

Supply voltage pin.

Ground pin.

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 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.

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

Output from the inverting oscillator amplifier.

4 AT90S/LS2323/2343

1004D–09/01

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