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

 There are 16 address lines
 It has to fetch two 8-bit data at a time
 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
 holds the address of the top of the stack
 counts the number of programs being executing on the microprocessor
 keeps the address of the next instruction to be fetched

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