programming P89C51RD2BN

[erikm]

send some documentary

well, you found this site -- use it

Erik

[shabbir]

to
89c51 expert group
dear sir
i am used to deal with an old variant rd2hbp, but now only rd2bn is available in market, i have no other option, but it gives me lots of problems. i am using simple hardware to program chip with /EA is tied with Vcc(+5V) & /PSEN is made low for programing. ALE & P2.7 are kept floating.the newly purchased chip was programmed well for 4-5 times using flash magic but then after it starts giving problems. the chip can be programmed, as it seems, but does not execute user code. iam using max232 cpe. this has happened to me for 5-6 chips. pls. guide me about where the problem lies. is this happened b'cos P2.7 is kept open or any thing else.
RST pin is connected to Vcc through 0.1 uF capacitor (as in datasheet)t swich is placed. is any further modification required in reset then suggest.
looking for your quick reply.
thanks a lot
shabbir

[Ow Tong Peow]

Hold PSEN LOW,  Tie it to ground during programming.

Hold RST for 0.5s,

Run Flash magic.