5. a) If it is required to use timer 1 for counting an external event using mode 1 then what is the value that would be loaded to timer mode register. b) Differentiate between mode 1 and mode 2 programming in 8051 timers. [2 c) What is the value to be loaded to timer's registers to have a delay of 2.5ms when 11.0592 MHz crystal is used. Write an assembly code to generate a pulse of width 2.5ms on P2.1 using timer 0 and mode1. [3