User`s manual

Description of 844USB ISP connector

Front view at ISP connector of programmer.

Specification of ISP connector pins depends on the device, which you want to program. You

can find it in the control SW for programmer (Pg4uw), menu Device / Device Info (Ctrl+F1).

Be aware, the ISP programming way of respective device must be selected. It is indicated by

(ISP) suffix after name of selected device.

These specifications correspond with application notes published of device manufacturers.

Used application notes you may find on www.bkprecision.com, section Support /

Application Notes.

Note: Pin no. 1 is signed by triangle scratch on ISP cable connectors.

844USB ISP cable

Warnings:

When you use 844USB 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.

844USB can supply programmed device only, but target system cannot supply

844USB.

844USB 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 844USB driver

H/L/read driver

in programmer

pin of ISP

connector

PU/PD driver

in programmer

C1=1nF, R1=1k3, R2=22k