Dataman 448PRO2AP-AU User Manual page 154

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 allows proper In-
system programming. Condition is exactly respecting these application notes. Applications
notes, which DATAMAN use in ISP programmers, are published in www.dataman.com,
section Support / 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 using 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 too. If pins are outputs, then use of
resistors saves a programming time. Of course the isolation resistors R1, R2, (R3) can be
replaced by switches or jumpers, if necessary. In that case, during the ISP programming of
target device the switches (jumpers) must be open. But the using of switches (jumpers) adds
a next manipulation time to programming procedure.
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