AT89C2051 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

AT89C2051

State-of-the Art Evaluation Module for 8, 20 & 40-pin Microcontrollers

Unspecified 

Evalu8r User Manual V2.00

RESET Configurations

An important difference between the Atmel 89C/89S and AVR microcontrollers is the polarity

of the RESET pin. The 89C/89S devices feature an ACTIVE HIGH Reset, where as the AVR

devices feature an ACTIVE LOW Reset. The Evalu8r module features user configurable RESET

polarity. It is necessary to change only two jumper settings as detailed below to support

either ACTIVE HIGH or ACTIVE LOW RESET polarity.

Active High RESET Function

Active Low RESET Function

S6

R11

120

Con 8

Pin 10

EXTERNAL

RESET

Vcc

C7

10µF

R4

10K

RESET

8051

Figure 29

R11

120

Con 8

Pin 10

EXTERNAL

RESET

Vcc

R10

10K

C10

10µF

RESET

S6

AVR

Figure 30

Suitable for 8051 microcontroller family

e.g. 87C/89C/89S devices

Figure 31

Link 3

Link 4

1-2

1-2

Suitable for:

All AVR microcontrollers

Link 3

2-3

Figure 32

Link 4

2-3

Please note the use of a C/R RESET circuit

will not prevent corruption of the on-chip

AVR EEPROM

12

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