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    Inaccuracy with background serial receive on 20X2

    Something rather odd with background serial receive on a 20X2. I'm driving the HSERIN pin (aka B.6) from the output of a 74F00 logic gate, that itself receives the serial signal from an opto-isolator. If I connect the gate output directly to HSERIN, then I get wildly inaccurate serial reads -...
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    Reading hardware serial input pin

    On an M2 part... is it possible to read the input state of the HSERIN pin independently of the background serial receive also watching it? Especially since the background serial receive is a bit different on the M2s. The documentation doesn't describe any interaction between hardware serial...
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    ADC channel numbers

    I am unable to find a proper reference for ADC channel numbers on M2 parts. Most of the pinout diagrams simply list the various ADC-capable channels as "ADC" and there is no indication of which channel number is mapped to which pin. By experimentation I was able to determine, for instance, on...
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    18M2+ download - hardware error - resistance values

    Very odd quirk and a new one for me. Wired up a brand new 18M2+ with the precise download hardware I've always used... Prolific USB to serial converter, and standard serial download circuit -- GND, RxD from pin 2, TxD to the two resistors... 10K to ground, 22K to pin 3. Neither LinAxePad or...
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    HSERSETUP Background Receive Scratchpad limits

    Given that the background receive feature is the godsend I've been waiting for... a question occurs to me regarding putting some limits around it. Once a background receive is set up with HSERSETUP and it starts working, at what point does it stop receiving? Never? When the scratchpad is...
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    PICAXE 28X EEPROM strangeness

    I must be losing my marbles. Have downloaded the following proggy to a 28X (actually two 28Xes, swapped it just to ensure it wasn't a bad chip): eeprom 0,(14) read 0,b0 sertxd("Startup location 0=",#b0,13,10) write 0,69 One would assume that on first run, the value printed would be...
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    08M serial speeds

    Is the 08M considered an 'X part' for the purpose of serial speeds? It does have the SERTXD at 4800 baud, like only an X part does. The documentation for SERIN and SEROUT suggest that the X parts have the 600/1200/2400/4800 baud speeds, and non-X parts have the 300/600/1200/2400 baud speeds...
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