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interrupt when 15V DC input to any particular pin of TMS320C5515 DSP Processor

Other Parts Discussed in Thread: TMS320C5515

Hi All,

could any body suggest me what should i do for this application...

i would like to make one application in which i am giving  +15 volt DC voltage to any particular one pin of TMS320C5515 DSP Processor. when i give 15v dc then  C5515 DSP Processor interrupt every things (whatever it is doing it should interrupt and it  should give 1000Hz of Square wave to any pin of processor.

can any body suggest me what should i use in this application.  because i can not use ADC hear .. in TMS320C5515 ADC take only max 1.5V input. so i can not use ADC hear. what should i go for ??? 

any idea ????

Please  suggest me some code , library, or how can i solve this issue...

Thank in Advance...

Regard 

Gaurav Garg