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fast pin clocking

 
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Eugeneo



Joined: 30 Aug 2005
Posts: 155
Location: Calgary, AB

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fast pin clocking
PostPosted: Tue Dec 30, 2014 9:27 pm     Reply with quote
Hey guys,

If you need to pulse a pin on a PIC24 at FOSC/2 for a x number of cycles.

I used this to update my LCD through a 8 bit Flash bus. Very fast and effective!


Code:

// make sure you set the tris register for output on these pins
// you can pre set the values for output so they are not in sync

#asm
MOV #0b0100000001000000, W0     // alternate ONLY the these pins
repeat #0xFFF                   // pulse pins 4095 + 1 times
XOR 0x02E8                  // port g
#endasm
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