In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Alessandro wrote:

Thanks for your answer!
 

To test the speed and the clockcycle i have put a led over the RB0 and through a 460OHM resistor to Vss.

 

The program to test the speed is simple:  it turn the led on and  than turn it off.

 

 

[2]
Initialize    ;Configure port settings

mov rb, #%00000000 ;Port B output zero

mov !rb,#%11111110 ;Port B.bit0 output dir.

;---------------------------- MAIN PROGRAM -----------------------------

Main

mov rb,#$01

mov rb,#$00 



jmp Main ;goto main

 

on 4 MHZ turbo, the high period is 470 ns, and the low period is a bit more because of the jump time.

Now on 4 MHZ the clock cycle is 250 ns, and the datasheet says that the move istruction takes 1 clock.

but it is longer! what is wrong? 

 

Thanks again 

Alessandro
[/2]

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=255649#m256201

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)