Dataman 48Pro - Manual (Page 88)

Direction of connect Dataman ISP
programmer to target system:
During in-system programming you connect two electrical
devices – ISP programmer and target system. Unqualified
connection can damage these devices.
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 Dataman programmers together
with respect of these application notes allow proper In-system
programming. Condition is exactly respect these application
notes. Applications notes, which Dataman use in ISP
programmers, are published in
www.dataman.com , section
Application notes.
Please, read some notes for following recommended circuits.
• Purpose of D1 diode is to protect the target circuit against a
higher voltage, which is provided by ISP programmer.
• If your target board supply differs from mentioned 5V,
choose please the Zener diode (D1) voltage according to
this supply voltage.
• We recommend to use resistors R1, R2, (R3) to separate
the target device from target system. If pins needed for ISP
programming are inputs in target system then separation
by resistors is sufficient and resistors make a low pass filter
88