English
Language : 

Z80C30 Datasheet, PDF (30/96 Pages) Zilog, Inc. – CMOS SCC SERIAL COMMUNICATIONS CONTROLLER
=&=& &026 6&&
6HULDO &RPPXQLFDWLRQV &RQWUROOHU

3ROOLQJ
:KHQ SROOLQJ DOO LQWHUUXSWV DUH GLVDEOHG 7KUHH VWDWXV UHJLVWHUV LQ
WKH 6&& DUH DXWRPDWLFDOO\ XSGDWHG ZKHQHYHU DQ\ IXQFWLRQ LV SHU
IRUPHG )RU H[DPSOH (QG2I)UDPH LQ 6'/& PRGH VHWV D ELW LQ
RQH RI WKHVH VWDWXV UHJLVWHUV 7KH SXUSRVH RI SROOLQJ LV IRU WKH &38
WR SHULRGLFDOO\ UHDG D VWDWXV UHJLVWHU XQWLO WKH UHJLVWHU FRQWHQWV LQGL
FDWH WKH QHHG IRU GDWD WR EH WUDQVIHUUHG 2QO\ RQH UHJLVWHU LV UHDG
'HSHQGLQJ RQ LWV FRQWHQWV WKH &38 HLWKHU ZULWHV GDWD UHDGV GDWD
RU FRQWLQXHV 7ZR ELWV LQ WKH UHJLVWHU LQGLFDWH WKH QHHG IRU GDWD
WUDQVIHU $Q DOWHUQDWLYH LV D SROO RI WKH ,QWHUUXSW 3HQGLQJ UHJLVWHU WR
GHWHUPLQH WKH VRXUFH RI DQ LQWHUUXSW 7KH VWDWXV IRU ERWK FKDQQHOV
UHVLGHV LQ RQH UHJLVWHU
,QWHUUXSWV
7KH 6&&¶V LQWHUUXSW VWUXFWXUH VXSSRUWV YHFWRUHG DQG QHVWHG LQWHU
UXSWV 1HVWHG LQWHUUXSWV DUH VXSSRUWHG ZLWK WKH LQWHUUXSW DFNQRZO
HGJH IHDWXUH ,17$&. SLQ RI WKH 6&& 7KLV DOORZV WKH &38 WR
UHFRJQL]H WKH RFFXUUHQFH RI DQ LQWHUUXSW DQG UHHQDEOH KLJKHU SUL
RULW\ LQWHUUXSWV %HFDXVH DQ ,17$&. F\FOH UHOHDVHV WKH ,17 SLQ
IURP WKH DFWLYH VWDWH D KLJKHU SULRULW\ 6&& LQWHUUXSW RU DQRWKHU
KLJKHU SULRULW\ GHYLFH FDQ LQWHUUXSW WKH &38 :KHQ DQ 6&&
UHVSRQGV WR DQ ,QWHUUXSW $FNQRZOHGJH VLJQDO ,17$&. IURP WKH
&38 DQ LQWHUUXSW YHFWRU FDQ EH SODFHG RQ WKH GDWD EXV 7KLV YHF
WRU LV ZULWWHQ LQ :5 DQG PD\ EH UHDG LQ 55 7R VSHHG LQWHUUXSW
UHVSRQVH WLPH WKH 6&& FDQ PRGLI\ WKUHH ELWV LQ WKLV YHFWRU WR LQGL
FDWH VWDWXV ,I WKH YHFWRU LV UHDG LQ &KDQQHO $ VWDWXV LV QHYHU
LQFOXGHG ,I WKH YHFWRU LV UHDG LQ &KDQQHO % VWDWXV LV DOZD\V
LQFOXGHG
(DFK RI WKH VL[ VRXUFHV RI LQWHUUXSWV LQ WKH 6&& 7UDQVPLW
5HFHLYH DQG ([WHUQDO6WDWXV LQWHUUXSWV LQ ERWK FKDQQHOV KDV WKUHH
ELWV DVVRFLDWHG ZLWK WKH LQWHUUXSW VRXUFH ,QWHUUXSW 3HQGLQJ ,3 
,QWHUUXSW 8QGHU 6HUYLFH ,86  DQG ,QWHUUXSW (QDEOH ,(  2SHUDWLRQ
36
)XQFWLRQDO 'HVFULSWLRQ