In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:

PROBLEM:
I'm getting a "Vpp Generation Failed" error message when I try to download program to SX18 to perfboard.

 

TEST PROCEDURE:

1) Downloaded a program to SX18 while it is in my solderless breadboard (beeps a piezo and displays a message on an LCD)

2) Program ran ok while SX18 in solderless breadboard.

3) Took the same SX18 chip and inserted it into my prototype perfboard.

4) Program ran OKl (beeps a piezo and displays a message on an LCD)

5) However when I try to reporgram the SX18 in the perfboard using the same computer and program, I get the error.

 

MY CONCLUSIONS:

 

1) perfboard is at least wired ok for power and the LCD

2) is it possible that the SX-Key (and therefore the resonator) is too far from the chip?

3) perfboard has on-board regulated power (LM387A, diode, two 100uF caps)

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