Elnec JetProg User Manual page 152

Note: When you don't keep below directions and you damage
programmer during in-system programming, it is damage of
programmer by unqualified manipulation and is out of warranty.
1. Turn off both devices – ISP programmer and target device.
2. Assign same GND potential for all devices, e.g. connect GND
of all devices by wire.
3. Insert one connector of ISP cable to ISP programmer, turn on
programmer and control program.
4. In control program select target device and operation options.
5. Start action on target device (read, program).
6. After direction of control program, connect other ISP cable
connector to target system and turn on it.
7. After direction of control program, disconnect other ISP cable
connector from target system and turn off it.
8. If you need another action on target device, you continue with
step 5.
The recommendation for design of target
system with ISP programmed device
The target system must be designed to allow all signals, which
are use for In-system programming to be directly connected to
ISP programmer via ISP connector. If target system use these
signals for other function, is necessary isolated these signals.
Target system mustn't affect these signals during In-system
programming.
For in-system programmable devices manufacturers publish
application notes. Design of ELNEC programmers together
with respect of these application notes allow proper In-system
programming. Condition is exactly respect these application
notes. Applications notes, which ELNEC use in ISP
programmers, are published in www.elnec.com, section
Application notes.
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ELNEC s. r. o.