COUNTERS ARE USED TO KEEP TRACK OF EVENTS . TIME DELAYS ARE IMPORTANT IN SETTING UP REASONABLY ACCURATE TIMING BETWEEN TWO EVENTS. COUNTERS A Counter is designed simply by loading an appropriate number into one of the registers and using the INR (Increment by one) or the DCR (Decrement by one) instructions.
What are counters in microprocessor?
What are counters in microprocessor? The Program Counter (PC) is a register structure that contains the address pointer value of the current instruction . Each cycle, the value at the pointer is read into the instruction decoder and the program counter is updated to point to the next instruction.
What is delay in microprocessor?
There are different places where the delay will be used. The processor doesn’t execute other tasks when the delay subroutine is executed. The execution times are used for the delay. The delay is generated when the instructions are executed in a loop .
What is counter and time delay in 8085 microprocessor?
| Program Time (T-States) | LXI B,FFFFH LOOP: DCX B MOV A,B ORA C JNZ LOOP RET 10 6 4 4 10 (For Jump), 7(Skip) 10 |
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What is counter in microprocessor 8085?
PC is a 16-bit register. It contains a memory address . PC contains that very memory address from where the next instruction is to be fetched for execution.
What is delay routine?
Delay routines are subroutines used for maintaining the timings of various operations in microprocessor . In control applications, certain equipment needs to be ON/OFF after a specified time delay. In some applications, a certain operation has to be repeated after a specified time interval.
What is a delay loop?
Time delay loops are often used in programs. These are loops that have no other function than to kill time . Delay loops can be created by specifying an empty target statement. ... This loop increments x one thousand times but does nothing else.
How do you calculate program counters?
A program counter is one of the register used in computer architecture and os. It holds the address of next instruction to be executed. After instruction is executed, it will incremented by one,(PC =PC +1) moreover program counter will be point to the next instruction.
Why is 4 added to program counter?
In MIPS, I know that the PC is incremented by 4 for each instruction. This is because the word is on a 32 bit boundary (4 bytes) . This makes sense to me, and naturally we need to increment the PC by the difference in spatial location of two consecutive words.
What is the function of program counter?
The program counter, PC, is a special-purpose register that is used by the processor to hold the address of the next instruction to be executed . The PLA automatically updates the PC to point to the next instruction during the op-code decode cycle.
How many pins are there in 8085?
The 8085 microprocessor is an 8-bit general purpose processor that can deal with the memory of 64K Byte. This microprocessor consists of 40-pins as well as works with +5V power supply.
What type of instruction is pop?
| Mnemonics, Operand Opcode(in HEX) Bytes | POP PSW F1 1 |
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What is the internal memory of a 8085 microprocessor?
What is 8085 Microprocessor? It has 8 bit data bus and 16 bit address bus, thus it is capable of addressing 64 KB of memory. It has 8 bit ALU 8 bit ALU that can perform 8 bit operations.
What is the use of counter in 8085?
The function of the program counter is to point to the memory address of the next instruction to be executed . When an opcode is being fetched, the program counter is incremented by one to point to the next memory location.
What is general purpose register?
General purpose registers are used to store temporary data within the microprocessor . ... It is of 16 bits and is divided into two 8-bit registers BH and BL to also perform 8-bit instructions. It is used to store the value of the offset. Example: MOV BL, [500] (BL = 500H) CX – This is the counter register.
What is example of program counter?
A program counter is a register in the CPU containing the address of the next instruction to be executed from memory. For example, when your computer is turned on, a signal places the decimal number F000 into the CPU . This action tells the computer to look at the first instruction on the motherboards flash memory chip.
