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

Besides possible code issues, I suggest reading some documentation before trying out random solutions, to wit:

- on the protoboards, /MCLR is already tied to Vdd through a 10k resistor (see the schematic for the boards at Parallax.com). Additionally, spec for the SX is to tie /MCLR to Vdd through 10k, not 4.7k or some other value

- RTCC can be tied to Vdd directly or through a 10k. I usually just tie it high. I don't think this would affect your particular application.

Question: the en/dis jumpers on your RTC board are for enabling/disabling pull-ups on SDA and SCL? Is that right? So we should presume that SDA and SCL are pulled-up in your current setup?

Now, in the code, it looks like you *must* receive a byte from the host (your PC?) in order to have the program continue after it TXes the time? Is that right? Are you indeed TXing to the SX from the PC? In other words, can you read the time out once? If so, if you TX a display command to the SX again, what happens?

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