Programing 28X2

[LED Maestro]

Hello,
Just a quick question about the download circuit for a 28X2 chip. Am I right in thinking that I need to build the circuit shown on page 35 of picaxe manual 1 to be able to download my code into my chip.
Many thanks

 

[BeanieBots]

Correct. You MUST have the two resistors as shown.
You do NOT need a resonator for a 28X2 and the reset button is optional but the reset pin MUST be held high.

 

[LED Maestro]

Cheers, thanks for that

 

[nick12ab]

Sort of.

The resonator is not required for downloading anymore and the current PICAXE download socket has the pins in a different order from the header shown in the diagram.

If a logic level programming cable is used (such as the AXE027), then the 22k resistor may be safely excluded but you could damage the chip by accidentally connecting a RS232 cable.

[hr][/hr]Edit: Got in a little bit too late

 

[srnet]

Hello,
Just a quick question about the download circuit for a 28X2 chip. Am I right in thinking that I need to build the circuit shown on page 35 of picaxe manual 1 to be able to download my code into my chip.
Many thanks

Sort of, take heed of the description in the manaul that follows the circuit diagram as well;

"The 28X1 and 28X2 have an internal resonator (4 or 8MHz) and so the external resonator is optional. On 28A and 28X parts it is compulsory."

 

[LED Maestro]

Thanks for the all the help. Will be careful when downloading the program.

 

[Vito55]

What internal resonator is in 28X2? 4 or 8 MHz? Where I can find that information?

 

[nick12ab]

What internal resonator is in 28X2? 4 or 8 MHz? Where I can find that information?

Look in PICAXE Manual 2 under setfreq. 28X2 defaults to 8MHz but allows you to select 32KHz, 500KHz, 1MHz, 2MHz, 4MHz, 8MHz and 16MHz using the setfreq command.

 

[Vito55]

Thanks, finally You show me the way. Everywhere was written: 4 or 8 MHz. ?

Thanks again.