AT90LS8535-4MC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90LS8535-4MC

8-Bit AVR® Microcontroller with 4K/8K Bytes In-System Programmable Flash

Atmel Corporation 

Port D (PD7..PD0)

RESET

XTAL1

XTAL2

AVCC

AREF

AGND

AT90S/LS8535

current if the pull-up resistors are activated. Two Port C pins can alternatively be used

as oscillator for Timer/Counter2.

The Port C pins are tri-stated when a reset condition becomes active, even if the clock is

not running.

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors. The Port D output

buffers can sink 20 mA. As inputs, Port D pins that are externally pulled low will source

current if the pull-up resistors are activated.

Port D also serves the functions of various special features of the AT90S8535 as listed

on page 86.

The Port D pins are tri-stated when a reset condition becomes active, even if the clock is

not running.

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.

AVCC is the supply voltage pin for Port A and the A/D Converter. If the ADC is not used,

this pin must be connected to VCC. If the ADC is used, this pin must be connected to

VCC via a low-pass filter. See page 68 for details on operation of the ADC.

AREF is the analog reference input for the A/D Converter. For ADC operations, a volt-

age in the range 2V to AVCC must be applied to this pin.

Analog ground. If the board has a separate analog ground plane, this pin should be con-

nected to this ground plane. Otherwise, connect to GND.

5

1041H–11/01

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