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Programming In System
Devices can be programmed in your circuit rather than on the board.
For In System Programming, (ISP), the 10 way programming lead is connected to a dual row 10
way (0.1" pitch) header on your circuit.
You will need to use either a multiplexer chip (such as a 4053) or wire directly to the Pins of the
device. Without a multiplexer chip, Serial Communications and SPI port will be unusable:
In addition the 5 Volts and Ground need to be connected to the programming lead.
DO NOT EXCEED 5 VOLTS (4.75 TO 5.25 VOLTS is allowed) OR YOU MAY DAMAGE YOUR
COMPUTER. THIS WARNING APPLIES TO ANY ISP SYSTEM. BEWARE !!!
ISP Header Layout
Ground
Vcc
MOSI
-PDI
LED
RST
SCK
MISO
-PD0
470R
10
9
1
2
Optional Program
Indicator circuit
Key way
