All pins are low after programming P87LPC764 with 89C52

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DrWhoF

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I programmed P87LPC764 with 89C52 code and all pins are LOW.
I can see oscillator pins active but nothing else seem to work.
What is going on?
Can someone help me!!!!!!!!!!
 

p87lpc764 programing

Before attempting to program an 8051 derivative you should carefully study its data sheet ..
The P87LPC764 has, amongst other differecies, two added configuration registers ..
One is located at A2h (AUXR1), the other is located at FD00h (UCFIG1) ..

Unfortunately, my friend, this IC that you have programmed, is gone ..

Get new one and try to add to your code the following lines:

Somewhere in the very beginning:

MOV 0A2h, #60h

and somewhere in the end:

ORG 0FD00h
DB 20h

These additions should make your 764 to start with all pins "H", should disable Brown Out option and enable pin P1.5 as /RESET ..

Regards,
IanP
 

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    DrWhoF

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Re: P87LPC764

OK.
Thanks.
DrWho
 

Re: P87LPC764

Also, be aware of the CLKR bit ..

When "0" the processor operates with the standard 12 clock cycles per machine cycle, when "1" there are 6 clock cycles per machine cycle ..

Regards,
IanP
 

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    DrWhoF

    Points: 2
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