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ADC0804LCJ Datasheet(PDF) 28 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # ADC0804LCJ
Description  8-Bit uP Compatible A/D Converters
PDF  41 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0804LCJ Datasheet(HTML) 28 Page - National Semiconductor (TI)

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Functional Description (Continued)
4.2 Interfacing the Z-80
The Z-80 control bus is slightly different from that of the
8080. General RD and WR strobes are provided and sepa-
rate memory request, MREQ, and I/O request, IORQ, sig-
nals are used which have to be combined with the general-
ized strobes to provide the equivalent 8080 signals. An
advantage of operating the A/D in I/O space with the Z-80 is
that the CPU will automatically insert one wait state (the RD
and WR strobes are extended one clock period) to allow
more time for the I/O devices to respond. Logic to map the
A/D in I/O space is shown in
Figure 14.
Additional I/O advantages exist as software DMA routines
are available and use can be made of the output data trans-
fer which exists on the upper 8 address lines (A8 to A15) dur-
DS005671-21
FIGURE 13. INS8048 Interface
SAMPLE PROGRAM FOR
Figure 13 INS8048 INTERFACE
DS005671-A0
DS005671-23
FIGURE 14. Mapping the A/D as an I/O Device
for Use with the Z-80 CPU
www.national.com
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