# PICMicrocontollerMathMethod

## Divide 8 bit int by 8 bit to 24 bit float (AN575)

```;***********************************************
;Floating point division of two unsigned integer
;8 bit variables
;
;Input: AARGB0 - dividend (nominator)
;       BARGB0 - divisor (denominator)
;Output:
;       AEXP, AARGB0, AARGB1 - quotient
;       (MICROCHIP format - AN575)
;       w = 0 on success
;       w = 1 error: divide by zero
;Temporaries:
;       BARGB1
;
;RAM - 5 bytes
;ROM - 41 words
;Speed - 7 + 4 + 8 * 9 + 4 + 14 * 23 + 4 = 413 instruction
;       cycles worst case (including call and return)
;***********************************************
fdiv24_8_8
movfw BARGB0
skpnz
retlw 1                ;divide by zero
clrf AEXP
movfw AARGB0
skpnz
retlw 0                ;zero result
;loop to use all 8 bits of dividend (integer 8 by 8 divide)
movwf AARGB1
clrf BARGB1
movlw 0x08
movwf AARGB0    ;aargb0 is used as loop counter
fdiv24_8_8b
rlf AARGB1, f
rlf BARGB1, f
movfw BARGB0
subwf BARGB1, w
skpnc
movwf BARGB1
decfsz AARGB0, f
goto fdiv24_8_8b
rlf AARGB1, f   ;aargb1 is the integer quotient so far
;loop to fill all the bits of 16bit mantissa
clrf AARGB0
movlw 0x8E
movwf AEXP
clrc
fdiv24_8_8c
rlf BARGB1, f
movfw BARGB0
skpc                    ;check carry (9th bit)
goto fdiv24_8_8d
subwf BARGB1, f
setc
goto fdiv24_8_8e
fdiv24_8_8d
subwf BARGB1, w
skpnc
movwf BARGB1
fdiv24_8_8e
rlf AARGB1, f
rlf AARGB0, f
decf AEXP, f
btfss AARGB0, 7
goto fdiv24_8_8c
bcf AARGB0, 7   ;replace explicit msb with sign
retlw 0
;***********************************************

Nikolai
http://techref.massmind.org/member/NG--944

```

 file: /Techref/microchip/math/div/8by8to24fp-ng.htm, 2KB, , updated: 2000/4/10 10:06, local time: 2024/3/4 03:48, TOP NEW HELP FIND:  44.220.62.183:LOG IN

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?Please DO link to this page! Digg it! / MAKE! PIC Microcontoller Math Method

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
 Did you find what you needed? "No. I'm looking for: " "No. Take me to the search page." "No. Take me to the top so I can drill down by catagory" "No. I'm willing to pay for help, please refer me to a qualified consultant"

.