Correct Instruction-Reg

[lchamarthi 2]

Hi Everybody! I would like to welcome suggestion in achieving the following task..... I have 4 inputs and 4 outputs named as X1, X2,X3 & X4 and outputs as Y1, Y2, Y3 & Y4. Here there is no output fixed to perticular input.Explaing in a better way i want to give choice to operator to enable which outputs enable for which inputs. Operator enters the data in the following way. X1 ---- 0001 means Y1 only enabled ---- 0010 means Y2 only enabled ---- 0100 means Y3 only enabled ---- 1000 means Y4 only enabled ---- 1001 means Y4 & Y1 enabled ---- 0011 means Y2 & Y1 enabled -- -- -- -- Like wise for 4 position binary 15 combination comes. The same thing will be done/configured for X2, X3 and X4 too. Now to achieve this, I thought of In the Operator Entry, if 1Digit = 1, Give Y1 2Digit = 1 Give Y2 3Digit = 1 Give Y3 4Digit = 1 Give Y4 keeping as a function block which same can used for the X2,X3 and X4. Hope you understood the above. Which instruction supposrts to achieve the above logic? Otherwise any best/simple way of doing as i feel i am making it complicated? Thanks in advance guys Have a nice time Lchamarthi

[BobB 58]

Use compare (CMP) or if a CS or CJ use =. When equals turn on a bit.

[lchamarthi 2]

Hi BobB, I can use Compare for the whole data register. But if i want compare whether 1st digit in a word is 0 or 1 which i can use? like wise 2nd digit in a same word....... Suppose D10 has the Data= 1010 ( Operator entered data stored in D10) here 1st digit is 0 here 2nd digit is 1 here 3rd digit is 0 here 4th digit is 1 Thanks Lakshmi

[BobB 58]

Use ANDW D0010 #FFF0 D0020 etc. Try it in the simulator - it does work. It is can be used as a mask to mask out what you do not want to compare. I use ANDW all the time for masking out what I do not want to compare for the time clock. ANDW whatever then CMP (or = in CJ/CS). Edited 10 Sep 2006 by BobB

[DrunkeN 0]

I am sure "move digit" instruction can help for both editing d10's digits and comparing only digits for readability in the future.

[BobB 58]

Been there as well many times. Quite frankly, find ANDW easier than constructing MOVD, making a mistake and having to re-do MOVD.