Mike,

99+99=198 in decimal
if Wreg=198
after DEW
your Wreg is 98  C=1 DC=0

Andre Abelian



-----Original Message-----

Thanks for setting that up and testing, it's appreciated.

I don't know how hard it is to set up but you might try the following;
DC= 1
C   = 1
W = 32
(This would be the result of adding 99 + 99)
Then execute the 'DAW
The result should be (according to Microchip for the 18F series)
DC= 1
C   = 0
W= 98

Using a 18F452, I arrived at the results (as above) that Microchip
said you should get.

I found a question nearly identical to mine in the Microchip
 Developers conference and their answer was as above. I still
don't know why but I asked. Maybe I'll get a response in a day or
two.

http://asp.microchip.com/webboard/wbpx.dll/~devtools
Search for DAW

Thanks again

Mike Jones

----- Original Message -----
From: "Andre Abelian" <engelec@EARTHLINK.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, February 04, 2003 2:46 PM
Subject: [PIC]: DAW how it works (BCD)


> Hi to all,
>
> I did some test using DAW instruction on MPLAB ICE2000
> and this is the result.
>
>         Movlw           0x0F            ; w reg has d=15: B=00001111
>         DAW                             ; do decimal adjustments
>         Movwf           BCD_REG ; BCD_REG has d=21 b=00010101 C=0
>
>
> Second digit (F)                05
> First  digit (0)     + 01
> Result               015        ; 0 means C=0: 1 is bits 4,5,6,7  and
>                                                         5 is bits
> 0,1,2,3
>
>
> Now lets deal with higher numbers
>
>         Movlw           0xEF            ; w reg has d=239: b=11101111
>         DAW                             ; do decimal adjustments
>         Movwf           BCD_REG ; BCD_REG has d=85 h=55 b=10101010
>
>
> Second digit (F)                15      ; decimal
> First  digit (E)     + 14       ; decimal
> Result               155        ; 1 means C=1: 5 is bis 4,5,6,7  and
>                                                         5 is bits
> 0,1,2,3
>
>
> Andre Abelian
>
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