In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Sparks-R-Fun wrote:

Stef,

   It is good and in some cases necessary to connect all of the VDD and GND connections.  They are especially helpful in allowing the chip to conduct its full current capabilities as tiny wires and connections are able to handle less current.  The multiple connections help overcome this effect.  

   As for the problem you described, can you run a simple test program on the same circuit without experiencing this problem?  It can be any simple program that is easy to tell if it is still running or not such as flashing an LED or toggling an output.  The purpose is to try to determine if this is strictly a hardware problem you are experiencing that will affect every program you run or if it seems to be dependant upon something in the DTMF software you are using.

   I hope this is helpful.

 - Sparks

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