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51 <h1> words/1ms.asm </h1>
52  
53 <p>
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58  
59 <pre>
60 ; ( -- ) Time
61 ; R(--)
62 ; busy waits (almost) exactly 1 millisecond
63 VE_1MS:
64 .db $03, &quot;1ms&quot;
65 .dw VE_HEAD
66 .set VE_HEAD = VE_1MS
67 XT_1MS:
68 .dw PFA_1MS
69 ; error: the additional instructions need appr.
70 ; 4 cpu cycles, Z should be decreased by 1 or 2
71 PFA_1MS:
72 .set delay_cycles = cpu_frequency / 1000
73 ldi zl, LOW( delay_cycles / 4 )
74 ldi zh, HIGH(delay_cycles / 4 )
75 sbiw zl, 42 ; internal plus forth kernel overhead
76 PFA_1MS1:
77 sbiw zl, 1
78 brne PFA_1MS1
79 rjmp DO_NEXT
80  
81 ; : ms 0 do 1ms loop ;
82 </pre>
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