The 40 pins of the microprocessor can be divided into
six groups
such as address bus, data bus, control signals & status signals; power supply & frequency, externally started signals and serial input/output ports.
What is a microprocessor sketch and explain the various pins of the 8085?
There are 3 clock signals, i.e. X1, X2, CLK OUT. X1, X2 − A crystal (RC, LC N/W) is connected at these two pins and is used to
set frequency
of the internal clock generator. This frequency is internally divided by 2. CLK OUT − This signal is used as the system clock for devices connected with the microprocessor.
What is the ground pin number in 8085 microprocessor?
The ground is connected to V
ss
at pin number
20
. X
0
& X
1
are the inputs from the clock generating circuit. It is shown at Pin number 1 & 2 respectively. It is used to synchronize the operations of the 8085 microprocessor.
What is pin configuration?
Configuration pins are
used to load the design data into SRAM-based FPGAs
. The bitstream defines the functional operation of the internal resources, interconnections and I/O for the FPGA. The configuration mode selected to program the FPGA is an important design factor to consider when assigning pins.
Which scheme is used in 8085 microprocessor?
Classification of Data Transfer Schemes
We can broadly classify the data transfer schemes into two modes – Serial Data Transfer and
Parallel Data Transfer
. Our device, the Intel 8085 Microprocessor, is a parallel device. Thus, it transfers 8 bits of information simultaneously over 8 data lines in the parallel I/O mode.
How many address lines are there in 8085 microprocessor?
The microprocessor 8085 has
16 bit
address lines from A15-A8 and AD7-AD0. These lines are used to transfer 16 bit address of memory as well as 8-bit address of I/O ports.
How many data lines are there in 8085 microprocessor?
In Intel 8085 microprocessor,
8 data lines
are provided to tranfer the data. These 8 lines are multiplexed and serve dual purpose use either for addressing or for data transfer. These 8 lines serve as the lower 8 bit of the 16 bit address(in Binary).
What are the 16 bit registers available in 8085 microprocessor?
The 8085 has six general-purpose registers to store 8-bit data; these are identified as- B, C, D, E, H, and L. These can be combined as register pairs
– BC, DE, and HL
, to perform some 16-bit operation. These registers are used to store or copy temporary data, by using instructions, during the execution of the program.
What is pin configuration of microprocessor?
| IO/M’ S1 Data Bus Status | 1 1 I/O read | 1 0 I/O write | 1 1 Interrupt acknowledge | 0 0 Halt |
|---|
What is S0 and S1 8085?
This signal separates memory and I/O devices. Status signals(S0 and S1): These are
output status signals used to give information of operation performed by
microprocessor. The S0 and S1 lines specify 4 different conditions of 8085 machine cycles.
Why do we use 8085 microprocessor?
It
provides status, control and timing signals
, which are required for the operation of memory and I/O devices. 8085 System Bus: Microprocessor communicates with memory and other devices (input and output) using three buses: Address Bus, Data Bus and Control Bus.
Why is it called 8085?
The Intel 8085 microprocessor has got his name as 8085 microprocessor as it is
a 8 bit microprocessor
and in olden days when they created the first processor of 4 bit named it as 4004 and they don’t that it is a processor which controls whole machine when the invented that its a processor they reversed the last two …
What is Sid and sod in 8085?
The 8085 Microprocessor has Serial Input/Output lines consisting of two pins as follows: 1.
Serial Output Data (SOD)
2. Serial Input Data (SID) They both are specially made for Input/Output which is further controlled by software. The transfer of data is controlled with the help of two instructions, i.e, SIM and RIM.
What are the different types of addressing modes in microprocessor 8085?
- Immediate Addressing Mode – In immediate addressing mode the source operand is always data. …
- Register Addressing Mode – …
- Direct Addressing Mode – …
- Register Indirect Addressing Mode – …
- Implied/Implicit Addressing Mode –
What are instructions in microprocessor?
An instruction is
a binary pattern designed inside the microprocessor to perform a specific function
. In other words, it is actually a command to the microprocessor to perform a given task on specified data. Instruction Set. The entire group of these instructions are called instruction set.
What is address line in microprocessor?
An address line usually refers to
a physical connection between a CPU/chipset and memory
. They specify which address to access in the memory. So the task is to find out how many bits are required to pass the input number as an address.
How many address lines of the 8085 microprocessor are required to address 1024 memory locations?
It means that a memory of 2048 words, where each word is 4 bits. So to address 2048 (or 2K, where K means 2^10 or 1024), you need 11 bits, so
11 address lines
.
Is 8085 an 8-bit or a 16-bit microprocessor?
Although the
8085 is an 8-bit processor
, it has some 16-bit operations. Any of the three 16-bit register pairs (BC, DE, HL or SP) can be loaded with an immediate 16-bit value (using LXI), incremented or decremented (using INX and DCX), or added to HL (using DAD).
What are the widths of 8085 address and data bus?
The 8085 microprocessor is an 8-bit processor available as a 40-pin IC package and uses +5 V for power. It can run at a maximum frequency of 3 MHz. Its
data bus width is 8-bit and address bus width is 16-bit
, thus it can address 216 = 64 KB of memory.
What is 16bit register?
The 16 bit Microprocessor means that it
has 16 address lines
. A 16 bit microprocessor is having 16bit register set. It have 16 address and data lines to transfer address and data both. Hence it is 16 address lines. The maximum addresses are 2^16 means 65536.
What is the PIN number of a 8085 microprocessor where RST 7.5 is present?
RST7. 5 pin is an input which is edge-sensitive. Peripherals uses it for sending a pulse, rather than a sustained high level, for the interruption of the processor.
Which pin of 8085 MPU is multiplexed?
Pins 12 to 19 of 8085 are
AD0 – AD7
which is the multiplexed address-data bus. Multiplexing is done to reduce the number of pins of 8085.
What are the instruction set of 8086?
| Instruction Description | INTO Software interrupts to indicate overflow after arithmetic operation. | LOOP Jump to defined label until CX = 0. | LOOPZ/LOOPE Decrement CX register and jump if CX ≠ 0 and ZF = 1. | LOOPNZ/LOOPNE Decrement CX register and jump if CX ≠ 0 and ZF = 0. |
|---|
How address and data lines are multiplexed in 8085?
Intel 8085 is an 8-bit microprocessor which has
16 address line
for 16-bit address of a memory location. 8 higher order address bits are transferred through 8 bit lines out of this 16 address line while remaining lower order 8 bits of the address are sent through another 8 lines multiplexed with the 8-bit data lines.
What are the functions of S0 and S1 pins?
S2, S1, S0 : Status pins. These pins are active during T4, T1 and T2 states and is returned to passive state (1,1,1 during T3 or Tw (when ready is inactive). These are used by the 8288 bus controller for generating all the memory and I/O operation) access control signals.
What is word length in 8085 microprocessor?
The word length of 8085 is
8 bits
. For 8086 it is 16 bits.
Which of the following are IO instruction of 8085?
Generally, a processor like 8085, to address one I/O port by sending out 8-bit port address
and IO/M* = 1
. For example, let us say, the chip select pin of an I/O port chip is activated when 8-bit address = F0H, IO/M* = 1, and RD* = 0.
What is the instruction set size of 8085 microprocessor?
In 8085, the length is measured in terms of “byte” rather then “word” because 8085 microprocessor has 8-bit data bus. Three types of instruction are:
1-byte instruction, 2-byte instruction, and 3-byte instruction
. In 1-byte instruction, the opcode and the operand of an instruction are represented in one byte.
How many registers are there in 8085?
The 8085 has
six
general – purpose registers to store 8-bit data; these are identified as B, C, D, E, H and L as shown in the figure.
What is the function of RIM instruction in 8085?
To
get the status information about the interrupt system
, RIM instruction provides status information about interrupt system and this instruction can be used for serial input of data. Through this RIM instruction, 8085 can know which interrupt is masked or unmasked, etc.
What is in and out instruction?
In
8085
Instruction set, there are two instructions in 8085 for communication with I/O ports. They are the IN and OUT instructions. The IN or OUT instruction mnemonics should be followed by an 8-bit port address.
Why is microprocessor called microprocessor?
The single chip CPU was called “microprocessor”
to indicate that it wasn’t a complete computer
. The term “microcomputer” was used to describe complete computers on a chip – memory and i/o included.
What is the difference between 8085 and 8086 microprocessor?
| Property 8085 Microprocessor 8086 Microprocessor | Data Bus Size 8-Bit 16-Bit | Address Bus Size 16-bit 20-bit | Clock Speed 3MHz Varies in range 5.8 – 10 MHz | Duty Cycle for clock 50% 33% |
|---|
What are the addressing modes explain it?
Addressing modes are an aspect of the instruction set architecture in most central processing unit (CPU) designs. … An addressing mode
specifies how to calculate the effective memory address of an operand by using information held in registers and/or constants contained within a machine instruction or elsewhere
.
What is addressing mode and types?
Addressing Modes– The term addressing modes refers to
the way in which the operand of an instruction is specified
. The addressing mode specifies a rule for interpreting or modifying the address field of the instruction before the operand is actually executed.
What is addressing mode with example?
| Addressing Modes Applications | Index Addressing Mode For array implementation or array addressing For records implementation | Base Register Addressing Mode For writing relocatable code i.e. for relocation of program in memory even at run time For handling recursive procedures |
|---|
