J5 - 9v battery connector, 3 reset, 1 power-on reset – Atmel AT89STK-06 User Manual
Page 6: 2 reset push button, Reset -4
Hardware Description
2-4
AT89STK-06 Demo Board Software Demo Guide
4339C–CAN–07/05
– No specific polarization mandatory
Note:
There is a diode voltage level between the negative output of the power supply
and the “GND”. This could introduce some gap of voltage during measurement
and instrumentation.
Figure 2-2 . Male JACK Outlet and Wires
Caution: Do not mount more than one power supply source on AT89STK-06 board.
J5 - 9V Battery connector:
– Need of a female 2 points connector
– Input supply from 6 up to 10V DC (example: 9V battery)
– Polarization mandatory
Figure 2-3 . EXT PWR Female Connector / Cable for 9V Battery
Caution: Do not mount more than one power supply source on AT89STK-06 Starter Kit.
2.3
RESET
Although the AT89C51CC03 & AT89C51AC3 microcontrollers have on-chip RESET
circuitry (c.f. microcontroller datasheet), the AT89STK-06 board provides to the
microcontroller a RESET signal witch can come from 2 different sources:
2.3.1
Power-on RESET
The on-board RC network acts as power-on RESET.
2.3.2
RESET Push Button
By pressing the RESET push button on the AT89STK-06 board, a warm RESET of the
microcontroller is performed.
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