Refer to Figure 11-21. What is the approximate value of the analog input if the microcomputer’s data bus is at 10010111 when R̅D̅ is pulsed LOW?

Figure 11-21

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Analog 0.5-3.5 V VREF IN REF Voc VREF Analog GND +5V supply 10 ΚΩ C 150 pF 매 0.5 V 1.5 V R 10 ΚΩ VIN(+) Voc V₁(-) VREF/2 Cik out Cik in CS WR RD (a) ADC0804 D₂ De Voc Ds D4 D₂ D₂ D₁ Do INTRO A GND D GND Data bus Digital GND AD1 Micro- processor AD₂ AD AD4 AD3 AD₂ Voc AD₁ ADO CINTO RD WR GND [16] Address bus Address decoding logic