Simple Question Please Help

[timllens]

Hi i am new to Pic programming i am a second year student and have just started programming using MPLAB abd CCSC complier, So please exscuse my ignorence and bad spelling.

My question concerns simple input and output on the PIC16F648A chip i have read a book where all the input and output is done by codes such as

OUTPUT_B(0x03);
and
INPUT(PIN_A0);

without any need to set up each pin to be an input or an output using TRIS

i was simply wondering if this is a correct way and will work as some of my friends think that the setup of input and output pins still has to be done

if it is anyhelp i am using
PCB v3.293
PCM v3.293
PCHv3.293

and MPlab v8.10

[dyeatman]

You are correct. In fact it is recommended that you NOT use TRIS statements and let CCS take care of pin I/O setup automatically. You still still need to control what features are enabled/disabled such as CCP and ADC.

[RLScott]

[SherpaDoug]

For a student I strongly recommend you write a short test program with and without # USE FAST_IO and look at the listing file (.lst) to see what the difference is. Once you understand the difference you will see why you rarely need to handle the TRIS yourself, but occasionally it is crucial.
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[timllens]

Thank you all. I will try out a prog and have a play arround with the fast io as I may need this soon for some of the apps that I intend to write.
Thanks again