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

work in a group of volunteer retired engineers at the Calif Science Center. We are designing and building an exhibit on electric circuits.

I (the only one with microprocessor experience, and it is 15 years old!) recommended that we use an sx-28 to control LEDs to show current paths. The ASM programming went smoothly and it works beautifully on SX-Sim. When I first downloaded it to the sx-28 proto board and tried to use the debugger, "running" was indicated, but all control buttons were shaded. Now I get the message "Vpp generation failed". The max voltage on the board (Vin - Vdd) is 10 v. The power supply is your 7.5 v, 1  wall supply.

I modified the program to test on a sx-52 proto board that I bought for a different project, but never used, with the same results.

Where do I measure Vpp? What can I do to save  the use of the sx-28? If I can not get this running soon we must use another method.

Please help me!!
 
Danw
danw@ieee.org
7979 Hollywood Blvd.
Los Angeles, CA 90046
323-850-8040

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