Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 It has to fetch two 8-bit data at a time
 There are 16 address lines
 It counts 16-bits at a time
 It facilitates the user storing 16-bit data temporarily

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of instructions being executing on the microprocessor
 counts the number of programs being executing on the microprocessor
 keeps the address of the next instruction to be fetched
 holds the address of the top of the stack

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Microprocessor
Ready pin of microprocessor is used

 to provide direct memory access
 to indicate that microprocessor is ready to receive outputs
 to indicate that microprocessor is ready to receive inputs
 to introduce wait state

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