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ÏÐÈÊËÀÄÍÛÅ ÈÍÑÒÐÓÊÖÈÈ
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Ïðèìåíåíèå DECO-èíñòðóêöèè ñ óêàçàíèåì áèòîâûõ îïåðàíäîâ â D+ (1£ n£ 8)
X4
[ S+ ] [ D+ ] n
DECO X0 M10 K3
Ðèñ. 6-71.
Ïðèìåð ïðîãðàììèðîâàíèÿ
DECO-èíñòðóêöèè ñ óêàçàíèåì áèòîâûõ
îïåðàíäîâ â D+
X2 X1 X0
011
4
2
1
7.
6.
5.
4.
3.
2.
1.
0.
00001000
M17 M16 M15 M14 M13 M12 M11 M10
C000101C
Åñëè n = 3, îáðàáàòûâàþòñÿ âõîäíûå îïåðàíäû Õ0, Õ1 è Õ2. Ïîòîìó ÷òî 2ⁿ = 2³ = 8
ïðåäñòàâëåíû â êà÷åñòâå àäðåñîâ öåëè ìåðêåðîâ Ì10...Ì17.
Çíà÷åíèÿ âõîäíûõ îïåðàíäîâ ðàâíû 1 + 2 = 3. Ñîîòâåòñòâåííî òðåòèé áèò àäðåñà öåëè, ò.å.
ìåðêåð Ì13, âêëþ÷àåòñÿ. Åñëè îáðàáàòûâàåòñÿ çíà÷åíèå âõîäíîãî îïåðàíäà “0", òî
âêëþ÷àåòñÿ ìåðêåð Ì10.
Ħ
Ïðèìåíåíèå DECO-èíñòðóêöèè ñ óêàçàíèåì ñëîâíûõ îïåðàíäîâ â D+ (1 ͨ n ͨ 4)
X4
[S+] [D+] n
DECO D0 D1 K3
15. 14. 13. 12. 11. 10. 9. 8. 7. 6. 5. 4. 3. 2. 1. 0.
D0 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 1
15. 14. 13. 12. 11. 10. 9. 8. 7. 6. 5. 4. 3. 2. 1. 0.
D1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0
Ýòè áèòû êîìàíäîé ÏÊ àâòîìàòè÷åñêè óñòàíàâëèâàþòñÿ íà “0".
C000102C
Ðèñ. 6-72. Ïðèìåð ïðîãðàììèðîâàíèÿ DECO-èíñòðóêöèè ñ óêàçàíèåì ñëîâíûõ
îïåðàíäîâ â D+
Ìëàäøèå 3 áèòà èç ðåãèñòðà äàííûõ D0 äåêîäèðóþòñÿ. Ðåçóëüòàò äåêîäèðîâàíèÿ 1 + 2 = 3
ïåðåäàåòñÿ â ðåãèñòð äàííûõ D1.  ýòîì ðåãèñòðå äàííûõ âêëþ÷àåòñÿ 3 áèòà.
Åñëè çíà÷åíèå äëÿ n ͨ 3, òî âñå íåíóæíûå áèòû áîëåå âûñîêîãî íîìåðà â àäðåñàõ öåëè
óñòàíàâëèâàþòñÿ íà íîëü.
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