ISP support for multiple PCBs usually requires a lot more efforts than single PCB or parallel chip programming support. This is the reason we ask for schematic in advance so we can check if PCB is designed with ISP in mind. With our experience, serial programming is not as simple as parallel programming because the target load is unknown. Each programming algorithm is customized for most of the cases to suit customer’s PCB design. There are many factors such as length of wires, crosstalk, Power needed by PCB and other adjacent components on PCB which needs to be considered while developing ISP programming algorithm.
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