AT89STK03 Atmel, AT89STK03 Datasheet - Page 10

• Manufacturer Part Number: AT89STK03
• Manufacturer: Atmel

Specifications of AT89STK03

• Lead Free Status / RoHS Status: Supplier Unconfirmed

2.2.1
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.4
2.4.1
AT89STK-03 Hardware User Guide
Regulator Output
Voltage Selection &
Power On
C51 Settings
INT1 Switch
EA Jumper
ALE led
Reset
Crystal
Features
Description
LEDs Settings
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
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.
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.
The push button is provided to generate a warm reset.
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.
11 LEDs are provided.
Name
PWR
ALE
LED0
LED1
EA Jumper
OFF
ON
ON
Power On/Off
Color
Red
Green
Green
Green
Code fetched from MCU’s internal memory
Description
Power Supply status
MCU activity status - This led is enabled by a solder gout on the solder pad SW4
General purpose led - Connected to P3.2 - Enabled by LED0 jumper
General purpose led - Connected to P3.4 - Enabled by LED1 jumper
Code fetched from an external memory
OFF
Description
R4
=
R3
×
-----------------------------
Vout Vref
Vref
–
Regulator Output Voltage
3.6V
Selection
Default configuration
Hardware Description
Comments
7609B–SCR–11/06
5V
2-7