Atmel AT89STK-06 Betriebsanweisung PDF herunterladen (Seite 10)

Hardware Description

AT89STK-03 Hardware User Guide 2-7

7609B–SCR–11/06

2.2.1 Regulator Output

Voltage Selection &

Power On

The 3.6V output can be changed by means of R4 resistor (solder side). The output volt-

age equation is:

Vref = 1.20V, R3 = 1MΩ

2.3 C51 Settings

2.3.1 INT1 Switch The INT1 switch can be disabled by removing the solder gout from the solder pad SW36

on the solder side of the CPU demonstration board.

2.3.2 EA Jumper

2.3.3 ALE led The ALE led reports the MCU state. It can be disabled by removing the solder gout from

the solder pad SW4 on solder side of the board.

2.3.4 Reset The push button is provided to generate a warm reset.

2.3.5 Crystal The 8 Mhz crystal can be removed in order to be placed next to the appropriate package

(PLCC68 or PLCC28). The load capacitors are disabled by default because the internal

oscillator of the MCU has been designed to work without them. However these capaci-

tors can be enabled by adding a solder gout on the solder pads SW34 and SW35 on the

solder side of the board.

2.4 Features

Description

2.4.1 LEDs Settings 11 LEDs are provided.

Power On/Off

Regulator Output Voltage

Selection

ON OFF 3.6V 5V

OFF

3.6V

R4 R3

Vref

Vout Vref–

-----------------------------×=

EA Jumper Description Comments

ON Code fetched from an external memory

OFF Code fetched from MCU’s internal memory Default configuration

Name Color Description

PWR Red Power Supply status

ALE Green MCU activity status - This led is enabled by a solder gout on the solder pad SW4

LED0 Green General purpose led - Connected to P3.2 - Enabled by LED0 jumper

LED1 Green General purpose led - Connected to P3.4 - Enabled by LED1 jumper

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Atmel AT89STK-06 Betriebsanweisung Seite 10