Simple Question in Assembly Programming

[reyge]

notepad++ how do you comment

Hello Experts!

I am a newbie in assembly. A and B are 8-bit registers. How do you efficiently implement this in assembly using the instruction set of pic16f876a?

if ( A == B )
call subroutine1
else
call subroutine2


One way, i think is to XOR A and B then use bit testing for all 8 bits. But that could be long.
Another way is to XOR A and B, then add one to the result, then use DECFSZ.

Any other way?

thanks!

 

[master_picengineer]

mpasm notepad++

Hi,

movf A , w
xorwf B , w
btfss STATUS , Z
call routine different_case
call routine equal_case

You have not to check if all the 8 bits are 0 but only check the Zero flag status of the operation. If Z is set this mean that A=B. And that's all.

Hope it help. Please press the helped me boutton.
Thanks.
Regards,
Master_PicEngineer

 

[reyge]

notepad++ assembly comment block

right! thanks!

 

[reyge]

notepad++ mplab

Hello again!

How do you comment several lines of code at once?

Like in C or C++, one can do this by placing /* at the start then */ at the end.

Thanks!

 

[blueroomelectronics]

MPASM is one line at a time, a semicolon at the start of the line is all their is.

 

[reyge]

ohh.. how sad.. haha

 

[Freddie Chopin]

if you are using MPLAB (and you probably are), you can select a block of text ot once, right-click it, and select Advanced / Comment Block. this way you can comment larg parts at once. you can of course uncomment it the same way, by using the un-comment block option.

0x41 0x56 0x45!!

 

[reyge]

Yup, I am using MPLAB but I am using Notepad++ to write the code.. But I didn't know there's a comment/uncomment block option in MPLAB. I just found out that there's also that option in Notepad++ for Assembly. Thanks!

Freddie Chopin, are you spanish?

I have another question, I know how to set the delay between two packets but how do you set the baud rate for USART simulation in the MPLAB?

Thanks!

 

[Freddie Chopin]

Location: Poland

are you one of those, who doesn't know where that country is? that's not a part of spain... actually it's quite far away...

as for USART simulation - sorry - I have not played with usart simulation yet. maybe mplab is able to guess the bps from the setting of usart module in pic.

0x41 0x56 0x45!!