find out the number of elements in an array of 8-bit element

Wed May 15, 2013 1:54 pm

find out the number of elements in an array of 8-bit elements that are a multiple of 8

Code:: #include <p18F8720.inc> ilimit equ 0x20 ; loop index limit count set 0x00 ii set 0x01 ; loop index mask equ 0x07 ; used to masked upper five bits org 0x00 goto start … ; interrupt service routines start clrf count,A movlw ilimit movwf ii ; initialize ii to ilimit movlw upper array movwf TBLPTRU,A movlw high array movwf TBLPTRH,A movlw low array movwf TBLPTRL,A movlw mask i_loop tblrd*+ ; read an array element into TABLAT andwf TABLAT,F,A bnz next ; branch if not a multiple of 8 incf count,F,A ; is a multiple of 8 next decfsz ii,F,A ; decrement loop count bra i_loop nop array db 0x00,0x01,0x30,0x03,0x04,0x05,0x06,0x07,0x08,0x09 db 0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13 db 0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D db 0x1E,0x1F end