Microprocessor
The stack pointer register in a microprocessor

 counts the number of programs being executing on the microprocessor
 counts the number of instructions 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
PUSH B instruction in 8085 microprocessor causes

 the contents of register B only to be copied in the stack
 registers B & C to be cleared
 the contents of registers B & C to be transferred in the stack and and the registers get cleared
 the contents of register B & C to be copied in 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 introduce wait state
 to indicate that microprocessor is ready to receive inputs

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