NS Doc mcu:pic16

32bit binary addition

2010-03-30T15:32:24+03:00

movf twofour0,w addwf prod0,f movf twofour1,w btfsc STATUS,c incfsz twofour1,w addwf prod1,f movf twofour2,w btfsc STATUS,c incfsz twofour2,w addwf prod2,f movf twofour3,w btfsc STATUS,c incfsz twofour3,w addwf prod3,f

32 bit signed math adapted from microchip AN

2010-03-30T16:02:29+03:00

Note - Zero and Carry flags are not set! ;****************************************************************************** ; ; Filename: QUAD_MATH_TESTS.ASM ; Function: Math routines using PIC16F87 ; Created: 29-Jul-2009 ; Author: Brian Beard ; Company: Lucid Technologies ; ;****************************************************************************** ; list p=16F87 ;list directive to define processor #include ;processor specific variable defini…

char2num - Convert 1 character hex code to number

2010-03-28T23:27:12+03:00

char2num local noLowerCase local convError local digit movwf temp sublw 'F' skipneg goto noLowerCase movlw 'a'-'A' subwf temp, f movlw temp noLowerCase ;test if the symbol i sless than '0': if sym - '0' >= 0 -> ok movlw '0' subwf temp, w ; temp - w skippz goto convError ; test if sym > 'F': if sym-'F'+1 >=0 -> error movlw 'F'+1 subwf temp, w skipneg goto convError movlw 'A' subwf temp, w skippz goto digit addlw 0x0A return digit movlw '0' subwf temp, w retur…

num2hex - convert byte to 2 hexadecimal ascii characters

2010-03-30T15:31:38+03:00

Converts byte in WREG to hexadecimal “string” consisting of 2 characters - low and high. Result is written in variables hexL and hexH (which must be defined) num2hex local noAddL local noAddH movwf temp movlw 0x0F andwf temp, w addlw '0' ; 9 - WREG movwf hexL movlw '9'+1 subwf hexL, w skippz ; skip if hexL>'9': hexL - ('9'+1) >= 0 goto noAddL movlw 'A'-'9'-1 ; 65-57-1 = 7; 58+7=65 addwf hexL, f noAddL swapf temp, w andlw 0x0F addlw '0' movwf hexH movlw '9'+1 subwf hexH,…