Atmel In-Circuit Programming...

I don't have experience with particulary that part but I have with T89C51CC01 and T89C51AC2 and thay all are ISP programmable and they have the same bootloader so I don't think your uC should be any different.

Those ISP uC can be put in ISP programming mode by software or by hardware conditions.

By software is that you call api function to start bootloader or jump to bootloader starting position I think it was something like F800hex.

By hardware was thet PSEN line had to be externaly pulled low upon processor STARTUP.

There are also some other bits that affect the startup process, it is the BLJB (Boot Loader Jump Bit), and it can be programmed with Flip (Atmel's program for ISP programming).

But there are application notes on ISP programming and there is also in uC datasheet a few pages on ISP programming, in CC01 and AC2 datasheets surely.

Best regards, Mickey

The 89C5115 doesn't have a PSEN line - being a 20-pin device, all memory access in internal.

I've read'em... but, unlike the 89C8252 and others, this one doesn't have an 'example circuit with ISP capability' to draw on.

Per default it is P1.0, which has to be pulled to gnd. But this may be configured to other Port-pins.

When the 'boot-mode' is reached successfully the processor answers a send 'U' on the rs232 on every baudrate, I have written a prg from exactly this purpose. Ive included every feature, which can be invoked by ISP: ftp://ftp.informatik.rwth-aachen.de/pub/packages/PCBWarrior/projects/jMi croISP1_0.inst.jar

Is it working now?

Greetings Klaus

this is not a ATMEL device, rather XELTEK part, so anything could go rw

Then how come I got the datasheet and bootloader info from the Atmel website...? :-)

This I gathered... do I have to dedicate P1.0 (or whatever pin it gets changed to...) as a bootloader-start signal? Or can I use it for other purposes?

At the moment, I'm only gathering info for a *very* preliminary idea... I may not melt solder on it for a while.

Thanks for the info, though...

I did not see it under AT89 but found it under T89 when I looked again sorry. rw

With care, you can use it - but one thing to watch, is if it is a general IP, and the device gets a WDOG fire when it is low, then the WDOG may not do what you hope :)

- As a Status LED type output, it will be fine.

The device number/description seems a little skewed ? Atmel _do_ have a T89C5115, but this is with 28/32 pin options. This device should share bootloader info with the close sibling T89C51CC02, and other same-release-time frame devices, like T89C51AD2, and T89C51RD2.

Part numbers AT89C5114/AT89C5116 do seem to relate to 20 pin devices, but not (yet?) in general release.

Atmel is changing to AT89.. numbers, but care is needed, as T89C51RD2 is NOTquite the same at the newer AT89C51RD2, to replace the Atmel T89C51RD2 you need theAtmel AT89C51ED2 :)

-jg

You think that's bad...? I've tried a parts-search on the Digi-Key, Mouser and Allied sites, and NOT ONE of them have any references for that particular chip. :-(

Might be easier to leave it dedicated to the bootloader signal. What I have in mind won't require more than five or six pins, plus the UART lines, anyway. :-)

That's part of what may be messing me up. I read the datasheet, saw that the device was labelled T89C5115, and thought that it was a typo.

And I messed up on the pin-count, too. I re-read the datasheet, and see that it has options for 28, 24, and 32 pins.

No, but it is historical... The T89.. numbers derive from the Temic Semi numbering ( which also used to be TSC8.. and also TS8.. ) dating from before Atmel bought Temic.

Newest devices, designed by the Temic team, are being called AT89C51ED2, AT89C51CC03 (etc) which brings the two families into a consistant 'future terminology'.

The latest Atmel web info merges all the devices [TSC/TS/T/AT] into one list, which can look a bit of a mish-mash if you don't know how they got there...

It does mean searching for devices/web prices can get confusing

-jg

In article , Jim Granville writes

The AT89C51ED2 is not directly compatible with the T89C51RD2 either, although it is closer.