/;7êíé$ /RZð3RZHU 7ìî(ì 6KRUWð+DXO 7UDQVFHLYHU
+DUGZDUH 0RGH 2SHUDWLRQ
,Q +DUGZDUH 0RGH WKH WUDQVFHLYHU LV DFFHVVHG DQG FRQð
WUROOHG WKURXJK LQGLYLGXDO SLQVï :LWK WKH H[FHSWLRQ RI WKH
,17 DQG &/.( IXQFWLRQVñ +DUGZDUH 0RGH SURYLGHV DOO WKH
IXQFWLRQV SURYLGHG LQ WKH +RVW 0RGHï ,Q WKH +DUGZDUH
0RGH 5326 DQG 51(* RXWSXWV DUH YDOLG RQ WKH ULVLQJ
HGJH RI 5&/.ï 7R RSHUDWH LQ +DUGZDUH 0RGHñ 02'(
PXVW EH VHW /RZï (TXDOL]HU &RQWURO VLJQDOV õ(&ì WKURXJK
(&êô DUH LQSXW RQ WKH ,QWHUUXSWñ 6HULDO 'DWD ,Q DQG 6HULDO
'DWD 2XW SLQVï 'LDJQRVWLF FRQWURO IRU 5HPRWH /RRSEDFN
õ5/223ôñ /RFDO /RRSEDFN õ//223ôñ DQG 7UDQVPLW $OO
2QHV õ7$26ô PRGHV LV SURYLGHG WKURXJK WKH LQGLYLGXDO
SLQV XVHG WR FRQWURO VHULDO LQWHUIDFH WLPLQJ LQ WKH +RVW
0RGHï
'LDJQRVWLF 0RGH 2SHUDWLRQ
7UDQVPLW $OO 2QHV
,Q 7UDQVPLW $OO 2QHV õ7$26ô PRGH WKH 7326 DQG
71(* LQSXWV WR WKH WUDQVFHLYHU DUH LJQRUHGï 7KH WUDQVð
FHLYHU WUDQVPLWV D FRQWLQXRXV VWUHDP RI RQHV ZKHQ WKH
7$26 PRGH LV DFWLYDWHGï 7$26 FDQ EH FRPPDQGHG
VLPXOWDQHRXVO\ ZLWK /RFDO /RRSEDFNñ EXW LV LQKLELWHG
GXULQJ 5HPRWH /RRSEDFNï
5HPRWH /RRSEDFN
,Q 5HPRWH /RRSEDFN õ5/223ô PRGHñ WKH WUDQVPLW
GDWD DQG FORFN LQSXWV õ7326ñ 71(* DQG 7&/.ô DUH
LJQRUHGï 7KH 5326 DQG 51(* RXWSXWV DUH ORRSHG
EDFN WKURXJK WKH WUDQVPLW FLUFXLWV DQG RXWSXW RQ 77,3
DQG 75,1* DW WKH 5&/. IUHTXHQF\ï 5HFHLYHU FLUFXLWV
DUH XQDIIHFWHG E\ WKH 5/223 FRPPDQG DQG FRQWLQXH
WR RXWSXW WKH 5326ñ 51(* DQG 5&/. VLJQDOV
UHFHLYHG IURP WKH WZLVWHGðSDLU OLQHï
/RFDO /RRSEDFN
,Q /RFDO /RRSEDFN õ//223ô PRGHñ WKH UHFHLYHU FLUð
FXLWV DUH LQKLELWHGï 7KH WUDQVPLW GDWD DQG FORFN LQSXWV
õ7326ñ 71(* DQG 7&/.ô DUH ORRSHG EDFN RQWR WKH
UHFHLYH GDWD DQG FORFN RXWSXWV õ5326ñ 51(* DQG
5&/.ô WKURXJK WKH 5[ MLWWHU DWWHQXDWRUï 7KH WUDQVPLWð
WHU FLUFXLWV DUH XQDIIHFWHG E\ WKH //223 FRPPDQGï
7KH 7326 DQG 71(* LQSXWV õRU D VWUHDP RI RQHV LI WKH
7$26 FRPPDQG LV DFWLYHô ZLOO EH WUDQVPLWWHG QRUð
PDOO\ï
)LJXUH êã /;7êíé$ 6HULDO ,QWHUIDFH 'DWD 6WUXFWXUH
CS
SCLK
ADDRESS / COMMAND BYTE
DATA INPUT / OUTPUT BYTE
SDI/ SDO R/W A0
A1
A2 A3
A4
A5
A6 D0
D1
D2
D3
D4 D5
D6
D7
127(
2XWSXW GDWD E\WH LV WKH
R/W- = 1: Read
ADDRESS /
COMMAND
R/W
0
A0
0
0
0
1
0
A4
X
R/W- = 0: Write
A6
BYTE
VDPH DV WKH LQSXW GDWD
E\WH H[FHSW IRU ELWV
'áèãæ! VKRZQ LQ 7DEOH éï
CLEAR INTERRUPTS
X=DON’T CARE
SET LOOPBACKS OR RESET
INPUT
DATA
BYTE
LOS
D0 (LSB)
DFM
EC1
EC2
EC3
REMOTE LOCAL
TAOS
D7(MSB)
ëðëå
L1