Intel 8085

The Serial Input Data (SID) and Serial Output Data (SOD) pins on an Intel 8085 are single wire I/O connections usable with the RIM and SIM instructions. Use of these pins is up to the hardware designer, but they can be used for serial data communications. There is no bit cell timer, however, such as provided by the 8253 USART. You have to provide all of the timing protocol with code, or with some other interrupt train, such as on RST 7.5.

When a microprocessor wants to store a byte of information in memory, or retrieve a byte of information from memory, it needs to refer to the address of the byte in the instruction. When direct addressing is used then the microprocessor instruction refers explicitly to the address that is to be used. When indirect addressing is used then the microprocessor instruction refers to a third object that refers to the address that is to be used. So, for example: Direct addressing: (*) Store the data at address 0x3C6E (*) Deliver the letter to house 12 on the street. Indirect addressing: (*) Store the data at whatever address is in register AX. (*) Deliver the letter to whichever house the occupant of house 7 tells you. So, in indirect addressing, the microprocessor instruction refers to some other "third-party" location (a register or another memory location) to find-out what the ultimate address to be used should be. The instruction does not contain all of the information needed to store the byte (or deliver the letter) but it does say where the missing information can be found. In direct addressing, the instruction contains all of the information needed to store the byte (or deliver the letter). This is basically true for all microprocessors but different microprocessors allow different forms of indirect addressing. For example, some use memory indirect addressing (the third party is another memory location), and some use register indirect addressing (the third party is a register).

The data bus is used to read or write (hence bi-directional) to the data location selected by the address written on the address bus. You only need to write (one-way) to the address bus to select the data location. It does not make sense to read from the address bus.

The data bus in the 8086 is 16 bits in size, while the address bus is 20 (16bits would only address 64KB of memory, an extra 4 bits allows to address the total of 1MB, this is done trough segmentation of the memory).

To form a multiplexed of data bus and address bus, four bits of 8086 address bus are grounded.

there are mainly 3 buses are there in 8085. They are:

Address bus :-Used to carry address

Data bus :- Used to carry data

Control bus :-Used to carry signals such as control and timing signals

By default IRQ 7 is assigned to LPT1.

Cash register

School Register

--------------------

processor register

User-accessible Registers

Data registers

Address registers

Conditional registers

General purpose registers

Floating point registers

Constant registers

Special purpose registers

Instruction registers

Model-specific registers

Control and status registers

Memory buffer register

Memory data register

Memory address register

Memory Type Range Registers

Hardware registers

There are 20 address lines and 16 data lines in the 8086 microprocessor. The low order 16 address lines are multiplexed with the data lines. Some of the high order address lines are multiplexed with status lines.

They provide instructional leadership and manage the day-to-day activities in schools, preschools and universities.

the purpose of mvi is to 8 bit data immidiatly to the register or memory example mvi b,05h will move 05h to register b

it is nothing

I think its SUB or SUI (subtract contents from accumulator)

You could just do,

mvi a, 00h

Direct description or direct characterization is when the author directly tells the audience about the traits of a character or situation. This differs from having the audience learn about the character through dialog between characters. Most writers use both direct and indirect descriptions.

Either in Assembly or in some high level language/the hex-code (for the mnemonics) that the microprocessor 8085 generally understands.

There are 6 general purpose Registers and Two special purpose registers:

General purpose registers(8 bit basically) are B,C,D,E,H,L and SPECIAL Purpose resisters are STACK PONITER,PROGRAM COUNTER these two are 16 bit registers.

If u want make general purpose registers as 16 bit registers, the combination is BC,DE,HL these are 16 bit pair registers

The external data bus can be as wide as desired, given the necessary compromises between performance, complexity, and cost. The wider the bus, the faster the theoretical aggregate data transfer rate.

In the 8085 and 8088, the external data bus is 8 bits wide; in the 8086, it is 16 bits wide; in the 80386, it is 32 bits wide; and in the modern incarnations of 64 bit processors, it is 64 bits wide.

because it has four internal register and four external data bus

Examples: /360: no accumulator 8080: A 6800: A and B 8086: AX ...