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Voltage References

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------...,<br />

I 2 MC3447s i<br />

I I<br />

OAV<br />

0101<br />

0103<br />

0105<br />

0107<br />

NDAC<br />

EOI<br />

IFe<br />

0102<br />

0104<br />

0106<br />

0108<br />

NRFD<br />

ATN<br />

REN<br />

I<br />

L ______ ...J<br />

IEEE 488-1978 BUS<br />

Trig<br />

MC3447<br />

FIGURE 8 - SIMPLE SYSTEM CONFIGURATION<br />

+5 V<br />

T/R1 080 00<br />

T/R 2<br />

Data<br />

087 07<br />

OAV R/Vii R/W<br />

RS0 A0<br />

MC6802<br />

or<br />

180 MC6800<br />

RS2 Address<br />

MPU<br />

iB2<br />

184<br />

186<br />

OAC<br />

EOI<br />

iFC<br />

SRO<br />

iB1<br />

183<br />

185<br />

187<br />

RFO<br />

MC68488<br />

GPIA<br />

IRO<br />

A15<br />

IRO<br />

ATN NOTE 1: Although the MC3447 transceivers are<br />

noninverting, the 488-1978 bus callouts appear<br />

inverted with respect to the MC68488 pin<br />

REN<br />

designations. This is because the 488-1978<br />

Standard is defined for negative logic, while all<br />

M6S0a MPU components make use of positive<br />

logic format.<br />

MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA<br />

-=<br />

7-76

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