Z80C30 Datasheet, PDF (32/96 Pages) Zilog, Inc. – CMOS SCC SERIAL COMMUNICATIONS CONTROLLER

=&=& &026 6&&
6HULDO &RPPXQLFDWLRQV &RQWUROOHU

7KH ,86 ELWV VLJQDO WKDW DQ LQWHUUXSW UHTXHVW LV EHLQJ VHUYLFHG ,I DQ
,86 LV VHW DOO LQWHUUXSW VRXUFHV RI ORZHU SULRULW\ LQ WKH 6&& DQG
H[WHUQDO WR WKH 6&& DUH SUHYHQWHG IURP UHTXHVWLQJ LQWHUUXSWV 7KH
LQWHUQDO LQWHUUXSW VRXUFHV DUH LQKLELWHG E\ WKH VWDWH RI WKH LQWHUQDO
GDLV\ FKDLQ ZKLOH ORZHU SULRULW\ GHYLFHV DUH LQKLELWHG E\ WKH ,(2
RXWSXW RI WKH 6&& EHLQJ SXOOHG /RZ DQG SURSDJDWHG WR VXEVHTXHQW
SHULSKHUDOV $Q ,86 ELW LV VHW GXULQJ DQ ,QWHUUXSW $FNQRZOHGJH
F\FOH LI WKHUH DUH QR KLJKHU SULRULW\ GHYLFHV UHTXHVWLQJ LQWHUUXSWV
7KHUH DUH WKUHH W\SHV RI LQWHUUXSWV 7UDQVPLW 5HFHLYH DQG ([WHU
QDO6WDWXV (DFK LQWHUUXSW W\SH LV HQDEOHG XQGHU SURJUDP FRQWURO
ZLWK &KDQQHO $ KDYLQJ KLJKHU SULRULW\ WKDQ &KDQQHO % DQG ZLWK
5HFHLYHU 7UDQVPLW DQG ([WHUQDO6WDWXV LQWHUUXSWV SULRULWL]HG LQ WKDW
RUGHU ZLWKLQ HDFK FKDQQHO
:KHQ HQDEOHG WKH UHFHLYHU LQWHUUXSWV WKH &38 LQ RQH RI WKUHH
ZD\V
‡ ,QWHUUXSW RQ )LUVW 5HFHLYH &KDUDFWHU RU 6SHFLDO 5HFHLYH &RQGLWLRQ
‡ ,QWHUUXSW RQ $OO 5HFHLYH &KDUDFWHUV RU 6SHFLDO 5HFHLYH &RQGLWLRQV
‡ ,QWHUUXSW RQ 6SHFLDO 5HFHLYH &RQGLWLRQV 2QO\
,QWHUUXSW RQ )LUVW &KDUDFWHU RU 6SHFLDO &RQGLWLRQ DQG ,QWHUUXSW RQ
6SHFLDO &RQGLWLRQ 2QO\ DUH W\SLFDOO\ XVHG ZLWK WKH %ORFN 7UDQVIHU
PRGH $ VSHFLDO 5HFHLYH &RQGLWLRQ LV RQH RI WKH IROORZLQJ UHFHLYHU
RYHUUXQ IUDPLQJ HUURU LQ $V\QFKURQRXV PRGH HQGRIIUDPH LQ
6'/& PRGH DQG RSWLRQDOO\ D SDULW\ HUURU 7KH 6SHFLDO 5HFHLYH
&RQGLWLRQ LQWHUUXSW LV GLIIHUHQW IURP DQ RUGLQDU\ UHFHLYH FKDUDFWHU
DYDLODEOH LQWHUUXSW RQO\ E\ WKH VWDWXV SODFHG LQ WKH YHFWRU GXULQJ WKH
,QWHUUXSW $FNQRZOHGJH F\FOH ,Q ,QWHUUXSW RQ )LUVW 5HFHLYH &KDUDF
WHU DQ LQWHUUXSW RFFXUV IURP 6SHFLDO 5HFHLYH &RQGLWLRQV DQ\WLPH
DIWHU WKH ILUVW UHFHLYH FKDUDFWHU LQWHUUXSW
7KH PDLQ IXQFWLRQ RI WKH ([WHUQDO6WDWXV LQWHUUXSW LV WR PRQLWRU WKH
VLJQDO WUDQVLWLRQV RI WKH &76 '&' DQG 6<1& SLQV KRZHYHU DQ
([WHUQDO6WDWXV LQWHUUXSW LV DOVR FDXVHG E\ D 7UDQVPLW 8QGHUUXQ
36
)XQFWLRQDO 'HVFULSWLRQ