p89c51rd2hba

[an17]

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]

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]

where can i get the errata sheet

[erikm]

>>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]

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