Zilog Z16C35 Manual de usuario descargar pdf (Pagina 293)

100

101

Application Note

Technical Considerations When Implementing LocalTalk Link Access Protocol

14-5

784 ;subroutine to time out bit time 4.3 usec per bit

785 ;register c contains the number of bits to be

counted down

786 ;**********************************************

000002ef 787 bittime:

000002ef f5 788 push af ;save status and a reg

000002f0 c5 789 push bc ;save

000002f1 e5 790 push hl ;save

791 ;

000002f2 3ed2 792 ld a,0d2h ;ctc1 int vector

000002f4 d3e5 793 out (ctc1_cont),a

794

000002f6 3edf 795 ld a,11011111b ;

000002f8 d3e5 796 out (ctc1_cont),a ;enable int

797 ;select counter mode

798 ;clk/trg edge starts with rising edg

799 ;time constant follows

800 ;software reset

000002fa 79 801 ld a,c ;reg c contains the number of bits

000002fb d3e5 802 out (ctc1_cont),a ;load the number of bits to be counted

803 ;**

000002fd e1 804 pop hl ;restore

000002fe c1 805 pop bc ;restore

000002ff f1 806 pop af ;restate status and a reg

00000300 fb 807 ei

00000301 c9 808 ret

809

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