AT89STK-05 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT89STK-05' PDF : 22 Pages View PDF
2.3 C51 Standard
Settings
Hardware Description
2.3.1 Reset
2.3.2 Clock
2.3.3 EA
The external Reset push-button (SW3) is provided to easily generate a warm reset. This
button is used for ISP process. The Reset applied is active low.
A crystal can be easily installed on the Y1 socket. The clock can also be provided using
the J8 connector instead of the crystal.
Note: Remove the clock generators before the using the programmer.
Place a jumper on the EA connector (J10) to force the EA pin to ground and execute
external code. Otherwise internal code will be executed.
Figure 2-3. EA Circuitry
2.3.4 INT0
In order to use the on-board INT0 circuitry, connect the J7 Jumper to the AT89C5131A.
When you press the INT0 button (SW5), the P3.2 pin will go low which induces an inter-
rupt event.
Note: Remove the J7 jumper before using the programmer. Otherwise the program-
mer will not function.
Figure 2-4. INT0 Circuitry
AT89C5131A Starter Kit Hardware User Guide
2-5
4245A–USB–11/04
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