Question

1. Can An Rc Circuit Be Used As Clock Source For 8085?

2. What Are Level-triggering Interrupt?

3. How Can Signals Be Classified For The 8085 Microprocessor?

4. Write A Program That Will Store The Contents Of An Accumulator And Flag Register At Locations 2000h And 2001h.?

Answer 1

1. Can An Rc Circuit Be Used As Clock Source For 8085?

Yes, it can be used, if an accurate clock frequency is not required. Also, the component cost is low compared to LC or Crystal.

2.What Are Level-triggering Interrupt?

In level triggering the circuit will become active when the gating or clock pulse is on a particular level. This level is decided by the designer. We can have a negative level triggering in which the circuit is active when the clock signal is low or a positive level triggering in which the circuit is active when the clock signal is high.

3. How Can Signals Be Classified For The 8085 Microprocessor?

The signals of the 8085 microprocessor-based on their functions can be classified into 7 categories namely:
- Frequency and power signals
- Address and data buses
- The control bus
- Interrupt Signals
- Serial Input / Output signals
- DMA signals
- Reset Signals

4. Write A Program That Will Store The Contents Of An Accumulator And Flag Register At Locations 2000h And 2001h.?

By making use of the Push & Pop instructions the program can be written as:
- LXISP, 4000H - this step initiates the SP at 4000h.
-PUSH PSW - the contents of the accumulator and flag are pushed into the stack.
- POP B
- MOV A, B
- STA 2000H
- MOV A, C
- STA 2001H
- HLT

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