 |
 |
| View previous topic :: View next topic |
| Author |
Message |
dais
Joined: 03 May 2004
Posts: 11
|
| simple Input/output question |
 Posted: Fri Jun 04, 2004 1:10 pm |
 |
|
Hi,
I have a question about input and output mode.
SET_TRIS_B( 0x0F ); // B7,B6,B5,B4 are outputs
// B3,B2,B1,B0 are inputs
When I do INPUT_B()
Does it change b7,b6,b5,b4 into input mode then read or it only read B0-B3, and ignore B4-B8.
Thanks
Simin |
|
 |
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Fri Jun 04, 2004 1:27 pm |
|
|
| Quote: | SET_TRIS_B( 0x0F ); // B7,B6,B5,B4 are outputs
// B3,B2,B1,B0 are inputs
When I do INPUT_B()
Does it change b7,b6,b5,b4 into input mode then read
or it only read B0-B3, and ignore B4-B8. |
If you are using Standard i/o Mode, then yes, the compiler will set
the TRIS for all of Port B to be inputs, before it reads the port.
It will leave all the pins in that state.
If you are using Fast i/o mode for Port B, then the TRIS
state will not be changed by the compiler. |
|
|
Guest
|
|
| Posted: Fri Jun 04, 2004 2:26 pm |
|
|
PCM, Thanks for quick reply, I will use standard IO.
Simin |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
