Put the 35 into a register and successively subtract 10 from it
and every time through the loop add 1 to another register.
Check the status flags for an underflow, and when you get one,
add back the latest '10' you subtracted and put the remainder in
the third register.   See the following run through...

w = 35                                                ; Initial number
num    equ    0x20                                ; Temporary holding place
for number
tens    equ    0x21                                ; Holding place for Tens
ones   equ    0x22                                ; Holding place for Ones

movwf    num                                        ; Put num in holding
register
movlw    0x0A                                     ; Subtract 10d from num
register
subwf     num,1                                    ; place result back in
temp register
btfss       0x03,1                                   ; Check for underflow
goto        rmdr                                      ; If underflow, go get
the units count
movlw    0x01                                      ; Add one to tens
register to count
movwf    tens                                       ; this time through the
loop
goto       $-6                                        ; If not, go back and
subtract another 10d

rmdr:                                                   ; Get units count
addwf    num,0                                    ; add the last 10d back
into the number
movwf    ones                                      ; 'w' now contains the
ones remaining
return                                                   ; Go back to
calling program


So we subtract 10 from 35, put the result (25) in num, and check for
underflow.
No underflow, so we subtract another 10 and put result in num (15), check
for underflow.
No underflow, so we subtract another 10 and put result in num (5), check for
underflow.
No underflow, so we subtract another 10 and put result in num (-5), check
for underflow.
We have underflow this time, so we add the last subtract back into num
making it 5 again.
And we save this number in the Ones register.

So at this point we have 'w' containing 5, num containing 5, Tens containing
3, and ones containing 5














----- Original Message -----
From: Tim Webb <tim_webb@AGILENT.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, February 01, 2002 5:37 PM
Subject: [PIC]: Binary to Decimal conversion help


> I have a number from 0 to 35 and I want to seperate the tens and the ones
> into two seperate file registers
> How do I do it using a 16F877 ?
>
> Most of examples that I have found on the piclist are using instructions
the
> 16f877 does not have.
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
>

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