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Hi there, i have problem in using AT89C52. When i used this ic, my board is not working at retrieving data and sending data to pc. Previously i have done using 8051 in demoboard and it works fine. For this AT89C52 i have included the library file <AT89x52> but still my board is not working , why? . i have enabled the "use on chip rom" and have connected the EA pin to logic high. but i do observe that there is no oscillation signal at pin 18. Is there any setting that i have to set for this AT89C52?? Please help me on this problem. Your help is much appreciated. Thanks. Nore
Hi there, Pin 18 is XTAL2. For good board (8051) i do observed oscillation signal. but for this AT89C52 i do not observed any signal on pin 18.i have checked the connectivity of this cap 33pF and the crystal , all components are connected to this ic. this crystal is working fine. i downloaded the hex code using chipmax programmer. In the Target device option there is a Xtal setting, the default setting is 24MHz, but i have change it to 11.0592MHz following my crystal usage. is this ok? is there any more setting that i should use on this keil program?? plse help. thanks
"In the Target device option there is a Xtal setting, the default setting is 24MHz, but i have change it to 11.0592MHz following my crystal usage. is this ok?" This has no effect whatsoever on your code or your processor - it is only used by the uVision simulator.
this cap 33pF I hope you mean these caps. Erik
hi there, yes it means these cap. actually i have discovered that my databus lines no connectivity . once the databus lines are connected, my board working fine. Anyway thank-you very much.