Indirect addressing is one of the most powerful addressing modes that a microcontroller can have. It allows us to work with a block of data in the memory of the microcontroller. Write a code example that will clear the 95 registers starting at address 20h up to address 7Fh, using indirect addressing. Include comments for key instructions. (11.5) In 1, instead of 95 clrf instructions, how many instructions does the code in 1 need? (1) Under what circumstances are driving stages required to interface the port pin to the peripheral device (4) The Oscillator Start-up timer (OST) is another on-chip timer that provides a further delay, once the PWRT delay is completed. State the pin as well as the number of delay cycles this timer provides. (2)