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

Transistortoaster,

Actually you need to disconnect the TTL oscillator from the chip in order to program it anyway.  It seems that most of those oscillator chips have diodes on their outputs which prevent the the SXKey from being able to generate the 12V porgramming voltage.  I learned this the hard way when I designed a PCB (and had about 5 proto boards etched) that used the enable on the oscillator to disconnect it from the SX chip.  I couldn't get the thing to program until Stephen Holland (Hollander?) mentioned the diode thing.  A few cut traces and suddenly everything was working.  The next rev of the PCB had a jumper that actually disconnected the clock physically.

[list]Thanks,
PeterM[/list]

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