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I suggest u should master the IIC protocol first if the IC used this.The general IO can simulate this protocol.If u need the sample code,mail me:noley@21cn.com.
to make sure pic16f877a not working
hi
First,u should ensure that the circuit must be low power when u programe online.Or u should connect the board power(+5v GND).
2.when u changed the xtal,u should change the xtal setting,like HS,XT,....etc.It's can be defined in the config words.
Try it.
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