ADC0804LCWM datasheet(17/56 Pages) TI1

17 / 56 page

ADC0801, ADC0802, ADC0803, ADC0804, ADC0805

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SNOSBI1C – NOVEMBER 2009 – REVISED JUNE 2015

Application Information (continued)

9.1.2.1 Interfacing 8080 Microprocessor Derivatives (8048, 8085)

This converter has been designed to directly interface with derivatives of the 8080 microprocessor. The ADC can

be mapped into memory space (using standard memory address decoding for CS and the MEMR and MEMW

strobes) or it can be controlled as an I/O device by using the I/O R and I/O W strobes and decoding the address

bits A0

→ A7 (or address bits A8 → A15 as they will contain the same 8-bit address information) to obtain the

CS input. Using the I/O space provides 256 additional addresses and may allow a simpler 8-bit address decoder

but the data can only be input to the accumulator. To make use of the additional memory reference instructions,

the ADC should be mapped into memory space. An example of an ADC in I/O space is shown in Figure 26.

Figure 24. ADC Tester with Analog Error Output

Figure 25. Basic “Digital” ADC Tester

Table 1. Decoding the Digital Output LEDs

OUTPUT VOLTAGE CENTER VALUES

FRACTIONAL BINARY VALUE FOR

WITH VREF/2=2.560 VDC

HEX

BINARY

MS GROUP

LS GROUP

VMS GROUP(1)

VLS GROUP(1)

15/16

15/256

4.800

0.300

7/8

7/128

4.480

0.280

13/16

13/256

4.160

0.260

3/4

3/64

3.840

0.240

11/16

11/256

3.520

0.220

(1)

Display Output=VMS Group + VLS Group

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