Assembler äëÿ íà÷èíàþùèõ
Àäàïòåð ñèíõðîííûõ êîììóíèêàöèé - ÷àñòü 4
0028 EE OUT DX,AL
;----- Ïðèåì ñèìâîëà
0029 BA 03FD MOV DX,SERIAL+5 ; Ðåãèñòð ñîñòîÿíèÿ êàíàëà
002C RECV:
002C EC IN AL,DX
002D A8 02 TEST AL,2
002F 74 FB JZ RECV
0031 BA 03F8 MOV DX,SERIAL
0034 EC IN AL,DX
0035 CB RET
0036 ASYNC ENDP
0036 CODE ENDS
END ASYNC
Ôèã.8.16 Óñòàíîâêà, ïåðåñûëêà è ïîëó÷åíèå äàííûõ ïî
àñèíõðîííîìó êàíàëó (ïðîäîëæåíèå)
Ïåðâàÿ ÷àñòü ïðîãðàììû ïðèìåðà èíèöèàëèçèðóåò ìèêðîñõåìó ACE
8250. Ïåðâûì äåëîì ïðîãðàììà íàñòðàèâàåò ñêîðîñòü ðàáîòû àäàïòåðà.
Çíà÷åíèå äåëèòåëÿ, ðàâíîå 384, óñòàíàâëèâàåò ñêîðîñòü 300 áîä.
Îáðàòèòå âíèìàíèå, ÷òî ïåðåä çàïèñüþ çíà÷åíèÿ äåëèòåëÿ ïðîãðàììà
çàíîñèò 1 â áèò 7 óïðàâëÿþùåãî ðåãèñòðà ïî àäðåñó 3FBH.
Îêîí÷àòåëüíûé âûâîä â ïîðò 3FBH çàäàåò õàðàêòåðèñòèêè ëèíèè.  ýòîì
Microsoft (R) Macro Assembler Version 5.00 1/1/80 04:05:50
Ôèã. 8.17 Îáðàáîòêà ïðåðûâàíèé îò ïîñëåäîâàòåëüíîãî êàíàëà Page 1-1
PAGE ,132
TITLE Ôèã. 8.17 Îáðàáîòêà ïðåðûâàíèé îò ïîñëåäîâàòåëüíîãî êàíàëà
0000 ABS0 SEGMENT AT 0
002C ORG 0BH*4
002C ASYNC_INTERRUPT LABEL WORD
002C ABS0 ENDS
0000 STACK SEGMENT STACK
