I knew there'd be a way to do this, since there are files for most PICs with all this stuff in - just didn't bother to look! Ta :)
Cool :-)
What I meant, was that if I need to change 2 bits (say, turn two motors on, but leave the other bits as they are), is it possible in one instruction, or would I need to have two conditional jumps, which would then require "buffering" the input, to make sure both conditions execute the same, even if an input changes between instructions
-- Danny
Dare we ask for a circuit ??
-- Regards ..... Rheilly Phoull
should be
why
PICs
not
motors
would
execute
AND is the way. For example, let's say we have a port value of b'100101' on the port and we wanted to turn off the first and last bits. We would AND the port value with b'011110'. This would let bits 1-4 pass thru unscathed, but bits 0 and 5 would be forced off. The code to do that would be:
movlw b'011110' andwf GPIO, F
If we wanted to turn them both on at the same time, we could OR (inclusive OR) the port value with b'100001'. This will turn on bits 0 and 5, but leave the rest unchanged. The code would be:
movlw b'100001' iorwf GPIO, F
XOR (exclusive OR) is how you 'flip' bits without knowing their current state. To toggle the first an last bits of the port, you could do something like this:
movlw b'100001' xorwf GPIO, F
It's still probably a good idea to use a shadow register (like your TMPOUT) instead of ANDing and ORing directly to the port.
Of course!
Ta :)
-- Danny
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