;******************************************************************************* ; Input: unpacked BCD in tenk:thou:hund:tens:ones ;Output: 16 bit binary in hi:lo ; Size: 35 instructions ;Timing: 3+34+3=40 instruction cycles ; ; Notes: ;1) if input is higher than 65535 output is meaningless ;2) algorithm synopsis: ; ;> dec2bin([1 10 100 1000 1e4], 16) ;ans = ;0000000000000001 ;0000000000001010 ;0000000001100100 ;0000001111101000 ;0010011100010000 ; ;Or coded in three levels ('+' represents +1, '-' represents -1): ;000000000000000+ * ones + ;000000000000+0+0 * tens + ;000000000++00+00 * hund + ;00000+0000-0+000 * thou + ;00+0+00-000+0000 * tenk ; ;bin = (((tens+thou+tenk*256)*2+ ; hund+hund*16+thou*256)*2+ ; tens+hund*16-thou*16+tenk*16*256)*2+ ; ones+tenk*16-tenk*256 ; ;January 22, 2001 by Nikolai Golovchenko ;******************************************************************************* dec2bin16 mov W, tens add W, thou mov lo, W add lo, W mov W, <<tenk mov hi, W mov W, <>hund add W, hund add lo, W mov W, thou add hi, W rl lo rl hi mov W, <>hund add W, tens add lo, W mov W, <>tenk snc or W, #$01 add hi, W mov W, <>thou sub lo, W sc dec hi clc rl lo rl hi mov W, <>tenk add W, ones add lo, W mov W, tenk snc mov W, --tenk sub hi, W retp ;*******************************************************************************
file: /Techref/scenix/lib/math/radix/dec2bin16.htm, 1KB, , updated: 2004/6/10 13:40, local time: 2024/12/2 11:31,
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