Intel 8085

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The interface in a microprocessor is an integrated circuit that performs the basic functions of the central processing unit. It enables a user to communicate with a computer.

ASCII (American Standard Code for Information Interchange) and BCD (Binary Coded Decimal) are standards for storing information in the binary sytem. ASCII is used for storing alphabetic, numeric, symbols, and control characters in 8-bit binary, and BCD is used for storing numbers 0-9 in 4-bit binary.

No, not at all this instruction MOV can not be used for immediate data transfer.

You will need to use command MVI Rd, 8 Bit Data for immediate data transfer.

Load instruction means to load the instruction from the memory to the processor (accumulator).. But store instruction is opposite of it,it stores information from accumulator to the memory.

ALE Address Latch Enable

The width of a data bus and the amount of data it can physically carry. It relates to how much data a computer can transfer within itself. A simple way of thinking of it is like a motorway. The more lanes there are on the motorway, the more cars can travel on it. A bus in a computer consists of lines of data being transferred around, so the more that can be carried, the faster your computer will go.

Stack memory is memory assigned to a task or other instruction loop that it uses to perform instructions. Stack is used any time variables are declared inline with the code (see example below). Stack is also used for preserving registers whenever the processor switches contexts (from task to interrupt, between interrupts, or between tasks).

Stack is provide either by the Operating System when the task is started, statically when a task is defined (as would be in an RTOS), or at compile time if there is no operating system. In the third case, the stacks in the system are assigned for each of the various interrupt contexts and the main loop.

Stack usage example:

void somefunc(int a)

{

// "int a" will be in a CPU register

int i=0; // May be either a CPU register or on the stack, depending on CPU architecture and compiler.

char c[10]; // Will exist on the stack

struct somestruct *ss=malloc(sizeof(struct somestruct));

// The memory that ss points to will be in the "heap", the pointer to this memory will be on the stack.

}

The 8085 is an eight bit computer running on a 16 bit address bus. It has eight registers, A, B, C, D, E, H, L, and FLAGS, along with a 16 bit PC (Program Counter) and SP (Stack Pointer). Most intructions deal with eight bit values, but some deal with 16 bit values, and some registers can be paired to hold 16 bit values, such as BC, DE, and HL. The 8085 has multiple interrupt lines, INTR, RST5.5, RST6.5, RST7.5 and TRAP, and it can address 256 bytes of IO space. It has serial input (SID) and serial output (SOD) pins, but there is no implicit UART functionality built in. The 8085 has a READY pin which can be used to interface to slow memory, and a HOLD/HLDA set of pins that can be used to allow other bus masters to take over, such as in DMA operations.

The top of stack to copied to the specified register and the stack pointer is incremented by 2. A special form of POP, RET, has the program continuing with the popped address in the program counter, i.e. a return from subroutine or function call.

The data size in the 8085 is 8 bits.

A data register is temporary data being transmitted or shifted in 1s or 0s to or from the byte-organized memory array from the bidirectional data bus. The write operation shifts data into the the byte-organized memory array and the read operation shifts data into the data register.

The period T is the time for one complete cycle of an oscillation of a wave. The frequency f is the number of periods per unit time (per second) and is measured in Hz, or cycles per second. These are related by:

f = 1/T

Therefore, for a period of T = 20µs = 20*(10^-9)s,

f = 1/(20*(10^-9))

f = 20*(10^9)

f = 20,000,000,000 Hz = 20 GHz.

The Correct and complete order of address:

1.Name of the person/company/institution/organisation etc.,

2.Building Name or Premises Name if available

3.Door Number and Street Name

4.Room Number and Floor Number in multistory building

5.Landmark or Area location

6.Name of the City with PIN Code

7.Country Name.

Reply from:

T.J.SURUTHI

H-63, Palaami Enclave

New Natham Road

Reserve Line

Madurai-625014

Tamil Nadu

India

You have the right to the freedom of religion, speech, press, assembly, and petition.

You have the freedom to practice the religion you desire.

Freedom of speech guarantees the right to say anything without getting punished according to a person's individual beliefs.

Freedom of press is the right to print and publish anything.

Freedom of assembly includes the right to assemble and the right to associate.

Freedom of petition is the right to try and change a law, rule, or something of authority, by gaining proper support without hindering the chance of getting in trouble for beliefs.

so basicly the freedom to say anything.

The EEPROM means Electrical Eraseable Progrmmable Read Only Memory

5 stands for 5 volt

LDA is an Intel 8085 opcode, 3AH, that loads that accumulator from a location specified in memory.

The ALE signal on the 8085 is Address Latch Enable. When ALE is true, the data bus contains the low order address information for the current bus cycle. External hardware, i.e. latches, are expected to follow the data bus when ALE is true. At the point where ALE goes false, at approximately the rising edge of CLK, the latches are expected to latch and hold the data bus, presenting it to the outside world as the low order address bus.

stack segment register

The 8086 interrupt priorities are concerned ,software interrupt have the highest priority,followed by NMI ,followed by INTR.The lowest priority signals are unmaskable interrupts.

this crystals deter mains how many no of machine cycles are need for the execution of one instruction

It increments the value of the D register by one.

The higher order address bus is not multiplexed with data bus of 8085 because that is the way Intel designed the processor.

Besides, the data bus is only 8 bits and the address bus is 16 bits. If you were to multiplex the whole address bus on the data bus, you would need two T1 (ALE) states, and that would be excess logic. Back to the original answer - that is simply the way Intel designed the processor.