Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 17 Jul 2017 My Price 14.00

microcomputer to the ADC

Figure 11-21 shows how the ADC0804 is interfaced to a microcomputer. It shows three control signals,  width= that come from the microcomputer to the ADC. These signals are used to start each new A/D conversion and to read (transfer) the ADC data output into the microcomputer over the data bus.

width=

width=

Figure 11-36 shows one way the address decoding logic could be implemented. The  width= signal that activates the ADC0804 is developed from the eight high-order address lines of the MPU address bus. Whenever the MPU wants to communicate with the ADC0804, it places the address of the ADC0804 onto the address bus, and the decoding logic drives the  width= signal LOW. Notice that in addition to the address lines, a timing and control signal (ALE) is connected to the  width= enable input. Whenever ALE is HIGH, it means that the address is potentially in transition, so the decoder should be disabled until ALE goes LOW (at which time the address will be valid and stable). This serves a purpose for timing but has no effect on the address of the ADC.

(a) Determine the address of the ADC0804.

(b) Modify the diagram of Figure 11-36 to place the ADC0804 at address E8XX hex.

(c) Modify the diagram of Figure 11-36 to place the ADC0804 at address FFXX hex.

Answers

Maurice Tutor
(5)
Status NEW Posted 17 Jul 2017 09:07 PM My Price 14.00

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