MiniProg won't program PSoC with MAX232 on SDATA line

Question: Unable to program PSoC with MiniProg when MAX232 is connected on SDATA line

 

Answer:

The MAX232 chip has internal 5K pull-up resistors.  If the SDATA pin is loaded by this 5K resistor, the MiniProg may not be able to program the PSoC.  If a 5K pull-down resistor is used, the MiniProg is able to program the PSoC.  One solution to this loading problem is to insert a jumper in the SDATA line that temporarily disconnects the 5K load.