Hi

I am using Assembly code.

I am trying to get the counter on the 8051 to count external input signal pulses from two shaft ENCODERS. After recieving the number of revolutions done by the encoder, I would like this number to be sent back to the PC displaying something like "NUMBER OF REVOLUTIONS =100" for say one minute.

I know that I have to use P3.4 and P3.5 and attach the encoders to these pins.

The problem is when writing the code, I have to configure the serial connection as well as the counter/timer, and it does seem simple but I'm not 100% sure what the code should look like.

Also when initialisng the serial i was going to use:

START: MOV SCON,#00010000 ;MODE 0, RECIEEVR ENABLE (REN)
MOV PCON,#0 ;SMOD goes to 0
MOV TH1,#-3 ;9600 BAUD RATE

Does thsi seem correct?

Also if i was going to use a counter, wouldn't I need to also initialise TH1? if i do then how can I use the TH1 SFR for both the serial and the counter?

I really need some help in writing this code.

It should be quite simple, because it just involves counting some pulses using a sensor and then sending this information back to the PC, so that i can visually see the number of counts that the sensor has counted.

please help if you can

thank you