User`s manual

844A ISP cable

Warnings:

• When you use 844A as ISP programmer, don’t insert

device to ZIF socket.

• When you program devices in ZIF socket, don’t insert

ISP cable to ISP connector.

• Use only attached ISP cable. When you use other ISP

cable (other material, length…), programming may occur

unreliable.

• 844A can supply target device only, but target system

cannot supply 844A.

• 844A apply programming voltage to target device and

checks his value (target system can modify programming

voltage). If the programming voltage is different as

expected, no action with target device will be executed.

Note: H/L/read 844A driver

H/L/read driver

in programmer

pin of ISP

connector

PU/PD driver

in programmer

Self test and calibration

If you feel that your programmer does not react according to

your expectation, please run the programmer selftest using

Diagnostic POD, enclosed with the standard delivery package.

For optimal results with programmer we recommend you

undertake every 6 months, an extended test and to check the

calibration. See instructions for selftest in the Diagnostics

menu of PG4UW.