Question

3. How to allocate the function of RAM in MCS-51? How to select one group in the four work registers as the current group? What is the byte address range of

bit-addressable region?

5. 8031 has four 8-bit parallel ports, if it is applied practically as 8-bit I/O port, which port of P0-P3 should be used in transmission? How to generate 16-bit address?

8. How does MCS-51 allocate the clock cycle, machine cycle and instruction cycle? When the oscillator frequency is 10MHz, how many microseconds in one machine

cycle?

9. In MCS-51’s expanded system, when the address of off-chip program memory is same as that of off-chip data memory, will the conflict happen or not? why?

10. What are the second functions of P0 in MCS-51?

11. What is the difference between the bit address 7CH and the byte address 7CH? What is the specific location of bit address 7CH in the memory?

Answer 1