Z85230 Datasheet, PDF (12/120 Pages) Zilog, Inc. – ENHANCED SERIAL COMMUNICATIONS CONTROLLER

==
(QKDQFHG 6HULDO &RPPXQLFDWLRQV &RQWUROOHU

3LQV &RPPRQ WR %RWK WKH = DQG =
&76$ &76% &OHDU 7R 6HQG ,QSXWV $FWLYH /RZ 7KHVH SLQV IXQFWLRQ DV WUDQVPLW
WHU HQDEOHV LI WKH\ DUH SURJUDPPHG IRU $XWR (QDEOH :5 ELW  LV  LQ ZKLFK FDVH
D /RZ RQ HDFK LQSXW HQDEOHV WKH UHVSHFWLYH WUDQVPLWWHU ,I QRW SURJUDPPHG DV
$XWR (QDEOH, WKH SLQV PD\ EH XVHG DV JHQHUDOSXUSRVH LQSXWV 7KHVH SLQV DUH
6FKPLWWWULJJHU EXIIHUHG WR DFFRPPRGDWH VORZ ULVHWLPH LQSXWV 7KH (6&&⁷⁰
GHWHFWV SXOVHV RQ WKHVH SLQV DQG PD\ LQWHUUXSW WKH &38 RQ ERWK ORJLF OHYHO WUDQVL
WLRQV
'&'$ '&'% 'DWD &DUULHU 'HWHFW ,QSXWV $FWLYH /RZ 7KHVH SLQV IXQFWLRQ DV
UHFHLYHU HQDEOHV LI WKH\ DUH SURJUDPPHG IRU $XWR (QDEOH :5 ELW  LV  RWKHU
ZLVH WKH\ DUH XVHG DV JHQHUDOSXUSRVH LQSXW SLQV 7KH SLQV DUH 6FKPLWWWULJJHU
EXIIHUHG WR DFFRPPRGDWH VORZ ULVHWLPH VLJQDOV 7KH (6&& GHWHFWV SXOVHV RQ
WKHVH SLQV DQG PD\ LQWHUUXSW WKH &38 RQ ERWK ORJLF OHYHO WUDQVLWLRQV
576$ 576% 5HTXHVW 7R 6HQG 2XWSXWV $FWLYH /RZ 7KH 576 SLQV FDQ EH XVHG
DV JHQHUDOSXUSRVH RXWSXWV RU ZLWK WKH $872 (1$%/( IHDWXUH :KHQ $872
(1$%/( LV RII WKHVH SLQV IROORZ WKH LQYHUVH VWDWH RI :5 ELW  :KHQ XVHG ZLWK
WKH $872(1$%/( IHDWXUH LQ $6<1&+521286 PRGH WKLV SLQ LPPHGLDWHO\
JRHV /RZ ZKHQ :5 ELW  LV  :KHQ :5 ELW  LV  WKLV SLQ UHPDLQV /RZ XQWLO WKH
WUDQVPLWWHU LV HPSW\
,Q 6'/& PRGH WKH 576 SLQV FDQ EH SURJUDPPHG WR EH GHDVVHUWHG ZKHQ WKH
FORVLQJ IODJ RI WKH PHVVDJH FOHDUV WKH 7[' SLQ LI :5¶ ELW  LV  :5 ELW  LV 
DQG :5 ELW  LV 
6<1&$ 6<1&% 6\QFKURQL]DWLRQ ,QSXWV 2U 2XWSXWV $FWLYH /RZ 7KHVH SLQV FDQ
DFW HLWKHU DV LQSXWV RXWSXWV RU SDUW RI WKH FU\VWDO RVFLOODWRU FLUFXLW ,Q WKH $6<1
&+521286 5(&(,9( PRGH FU\VWDO RVFLOODWRU RSWLRQ QRW VHOHFWHG WKHVH SLQV
DUH LQSXWV VLPLODU WR &76 DQG '&' ,Q WKLV PRGH WUDQVLWLRQ RQ WKHVH OLQHV DIIHFW
WKH VWDWH RI WKH 6<1&+817 VWDWXV ELWV LQ 5HDG 5HJLVWHU  EXW KDYH QR RWKHU
IXQFWLRQ
,Q (;7(51$/ 6<1&+521,=$7,21 PRGH ZLWK WKH FU\VWDO RVFLOODWRU QRW
VHOHFWHG WKHVH OLQHV DOVR DFW DV LQSXWV ,Q WKLV PRGH 6<1& LV GULYHQ /RZ WZR 5[
FORFN F\FOHV DIWHU WKH ODVW ELW RI WKH 6<1& FKDUDFWHU LV UHFHLYHG &KDUDFWHU DVVHP
EO\ EHJLQV RQ WKH ULVLQJ HGJH RI WKH UHFHLYH FORFN LPPHGLDWHO\ SUHFHGLQJ WKH DFWL
YDWLRQ RI 6<1&
,Q WKH ,17(51$/ 6<1&+521,=$7,21 PRGH 02126<1& DQG %,6<1& ZLWK
WKH FU\VWDO RVFLOODWRU QRW VHOHFWHG WKHVH SLQV DFW DV RXWSXWV 7KHVH RXWSXWV JR
/RZ HDFK WLPH D 6<1& SDWWHUQ LV UHFRJQL]HG UHJDUGOHVV RI FKDUDFWHU ERXQGDULHV
,Q 6'/& PRGH SLQV VZLWFK IURP LQSXW WR RXWSXW ZKHQ 02126<1& %,6<1& RU
6'/& LV SURJUDPPHG LQ :5 DQG 6<1& PRGHV DUH HQDEOHG
36
3LQ 'HVFULSWLRQV