Reading External values from PIC

[PA3040]

Dear All,
This is related to PIC 16f877a MCU

I need to read three external signals which is 8bit

Ex.
1. 10101010
2. 11100011
3. 11110000

Then I need to compare this readings with internal literal values and if mach put the output on the PORTB

My question is, which peripheral I must used for read the above values among Timers or CCP or USART
Please advice

Please advice

 

[jayanth.devarayanadurga]

How does your PIC receive the signals? Serially or in Parallel?

 

[PA3040]

How does your PIC receive the signals? Serially or in Parallel?

The signals are coming as 8 bit frame in Serially

 

[wp100]

The signals are coming as 8 bit frame in Serially

Not really enough info to go on; you do not define anything about the serial method / speed or what generates it.

You can use the hardware Usart if its a standard speed and protocol.

You could just use a port to monitor for the signal and test when it changes / combine with the interrupt functions from port B if its possible to use them as inputs at all ?

 

[PA3040]

Dear WP100, Thanks for the reply

Actually I need to design a signals generator to send MCU

Finally I should need send 8 bit signal and read it from MCU

Could you please give me a appropriate solution

Thanks in advance

 

[wp100]

Hi,

Sorry, but cannot quiet grasp what you are doing with the 8 bit signal and where it comes from ?

You say need to design a signal generator ? -that produces 8 bits ? - the same or constantly changing ?
A simple way would be a shift register where you set up the 8 bits by switches and then flush them out serially to the pic.

You then want to serially read in this signal and display it a 8 bits on Port B of a Pic ?

Is this what you are after ? https://www.sparkfun.com/products/9519

 

[PA3040]

Dear wp100 thanks for the reply

Actually I need is remote controller effect, but not commercially available one. I have to design both rx and tx

Please advice