i want to program the chips P89LPC922 and P89C51RD2BN using In-System Programming(ISP).I do not want to keep the RS232 interface connected after burnig the program on the chip.
can someone help?
thank u
You have to go in for stand alone programming.
For 89C51, whenever u want to program the chip, you make the PSEN (bar), pin as low. This is your PROGRAMMING MODE
Once u finish programming, you just have to make PSEN (bar) as open. It is internally pulled up. THis is your RUN MODE.
As stated by headcracker you have to use PSEn Pin eigher connect it with a switch having one end connect to pull downd resisor and other to ground and you can move in pprograming and run mode with the help of switch