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Electronegativity
Mad Scientist

Date Joined Jun 2005
Total Posts : 261

Posted 2/23/2006 10:05 AM (GMT -8)

32 bit O/S and 32 I/O pins, hmm....

Is it possible to push data from a register at one bit per pin?

Like if you set an SX register to output and then moved a byte into that register.

I'm trying to figure out how easy it would be to effect parallel data transfer.

I wonder if this wire is hot...

Jon Williams
Registered Member

Date Joined Jul 2004
Total Posts : 6440

Posted 2/23/2006 10:15 AM (GMT -8)

Sure: outa := myPinValue, where myPinValue is a Long.

Jon Williams
Applications Engineer, Parallax

Paul Baker
Registered Member

Date Joined Jul 2004
Total Posts : 6316

Posted 2/23/2006 10:15 AM (GMT -8)

Each processor has its own registers for the pins (there are 3, 1 for direction, one for reading, one for writing), so yes its is as simple as moving the contents of 1 internal register to the pin output register, and if the pins are configured as output, the value will be moved parallel-wise to the pins.

1+1=10

Electronegativity
Mad Scientist

Date Joined Jun 2005
Total Posts : 261

Posted 2/23/2006 10:33 AM (GMT -8)

Excellent.

Just to clarify the terminology, I am used to a long being 2 bytes and 4 bytes being a double.

I get the impresion you might be using long as 4 bytes here.

I wonder if this wire is hot...

Paul Baker
Registered Member

Date Joined Jul 2004
Total Posts : 6316

Posted 2/23/2006 10:43 AM (GMT -8)

Yes, while there is some variation in certain circles, the common nomenclature is 1 byte=byte, 2 bytes=word, 4 bytes=long, 8 bytes=double long.

1+1=10

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