Messages

Yes.. simply swapping one device in the same hardware for another...
The device is alright to enter the ISP mode which has been successed at once.. i operated in 19600BPS..Yesterday
But other device of same part number is not operating....
I was selecte device correctly.
I'll show you various massages what i get...

"Unable to connect..........Reset the H/W into ISP mode again"
"Operation Fail"
".....X-tal frequency......"

How to ensure the operation of ISP mode? I got steps as a manual...
Bless to your advice.... Plz, save me..... ;

I have written a HEX-code to the device... success....
But when i try to write same code to the other P89C51....
i can't..... -_-;;
Same device and same program... i'll descript the environment

Program: Flash Magic
X-tal Oscillator: 11.0592 MHz
RS-232 Transciver : No problem
Baud Rate : 9600BPS

when hard reset(Falling Edge)
            /PSEN : Low
            Vpp : 5V
            P2.7, P2.6 : High
            ALE : Floating

Signal responce of failure is so fast....
So i think that is OK to enter ISP mode but  does't match BPS...
And i get a massage that is
 "Unable to coeect at the specified baud rate. Try reducing the baud rate. Reset the H/W ISP mode again."
I try all of BPS case in view to communicate... but failed

Plz, Have you some advice? I don't know what is problem and can't understand that result in same device and conditions.



Post Edited (06-29-05 20:24)