development board Version 3
Posted: Thu Sep 18, 2008 3:46 pm
Hi Folks,
I am new to this forom so hello to everyone, I have got version 3 development board and am using flowcode version 3. I was looking at the circuit diagram for the board which is available on the matrix multimedia website. Am I right in thinking that the board uses Port A and port B for I/O. I guess this is due to the fact that the board can use a variety of PICs and the board must be designed assuming the smallest devise. However the thing that I cant understand is that it seems that only four bits of Port A are bieng used RA0-RA3, if so how are these bieng expanded to eight bits for the LEDs, switches and external I/O. In flow code if I was to output the decimal number 255 to the LEDs then I would excpect all eight LEDs to illuminate, however as there really only four bits where is the hardware thats expanding it. I know this may be fairly obvious to some, however I cant find the device on the circuit diagram. Thanks in advance for your help.
Jag.
I am new to this forom so hello to everyone, I have got version 3 development board and am using flowcode version 3. I was looking at the circuit diagram for the board which is available on the matrix multimedia website. Am I right in thinking that the board uses Port A and port B for I/O. I guess this is due to the fact that the board can use a variety of PICs and the board must be designed assuming the smallest devise. However the thing that I cant understand is that it seems that only four bits of Port A are bieng used RA0-RA3, if so how are these bieng expanded to eight bits for the LEDs, switches and external I/O. In flow code if I was to output the decimal number 255 to the LEDs then I would excpect all eight LEDs to illuminate, however as there really only four bits where is the hardware thats expanding it. I know this may be fairly obvious to some, however I cant find the device on the circuit diagram. Thanks in advance for your help.
Jag.