Author Topic: p89c51rd2hba  (Read 6221 times)

an17

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p89c51rd2hba
« on: October 19, 2004, 01:27:39 am »
hi guys i am hoping someone could help me i have made myself programmer. It is for a p89c51rd2hba chip but i can't get it to connect in flash magic. It doesn't connect at any board rate. My setup is as follows it has a 10mhz crystal, i have vpp going to vcc 5 reset going to ground via a o.1uf capacitor and psen is going to ground  p2.7 is going to 5 volts i am using a max232 which is connected to tx and rx.Ale is connectd to 5 volts
if any one could give me some help i would greatful

erikm

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Re: p89c51rd2hba
« Reply #1 on: October 19, 2004, 05:31:10 am »
reset going to ground via a o.1uf capacitor

Read the errata it states (in nice words) "if you use capacitor reset you are screwed"

Erik

an17

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Re: p89c51rd2hba
« Reply #2 on: October 19, 2004, 04:53:53 pm »
where can i get the errata sheet

erikm

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Re: p89c51rd2hba
« Reply #3 on: October 20, 2004, 05:16:27 am »
>>where can i get the errata sheet<<

If you tool the time to read the "cover page" for the chip on the Philips web, you would know.

Erik

Andy Ayre

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Re: p89c51rd2hba
« Reply #4 on: October 20, 2004, 09:10:45 am »
I guess it is hidden on the site somewhere. Here is the direct link.

http://www.semiconductors.philips.com/acrobat_download/erratasheets/ES_89C51Rx2Hxx_03_091702.pdf

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