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In what way and differs and features. It can be easily interfaced with microprocessor. PIN Diagram 1. AD0-AD. HOLD: It indicates that another device is requesting the use of the address and data bus. Having received HOLD request the microprocessor relinquishes the. The various INTEL port devices are , /, , and . Peripheral Interfacing is considered to be a main part of Microprocessor, as it is the.

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This capability matched that of the competing Z80midroprocessor popular derived CPU introduced the year before. An Intel AH processor. For example, multiplication is implemented using a multiplication algorithm. The accumulator stores the results of arithmetic and logical operations, and the flags register bits sign, zero, auxiliary carry, parity, and carry flags are set or cleared according to the results of these operations.

There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, Discontinued BCD oriented 4-bit In many engineering schools [7] [8] the processor is used in introductory microprocessor courses.

This unit uses the Multibus card cage which was intended just for the development system. Although the is an 8-bit processor, it has some bit operations.

An immediate value can microorocessor be moved into any of the foregoing destinations, using the MVI instruction. The Intel ” eighty-eighty-five ” is an 8-bit microprocessor produced by Intel and introduced in However, an circuit requires an 8-bit address latch, so Intel manufactured several support mciroprocessor with an address latch built in.

Also, the architecture and instruction set of the are easy for a student to understand. All 2-operand 8-bit arithmetic and logical ALU operations work on the 8-bit accumulator the A register.

Adding HL to itself performs a bit arithmetical left shift with one instruction. As in many other 8-bit processors, all instructions are encoded in a single byte including register-numbers, but excluding immediate datafor simplicity.


Like larger processors, it has CALL and RET instructions for multi-level procedure calls and returns which can be conditionally executed, like jumps and instructions to save and restore any bit register-pair on the machine stack. The only 8-bit ALU operations that can have a destination other than the accumulator are the unary incrementation or decrementation instructions, which can operate on any 8-bit register or on memory addressed by HL, as for two-operand 8-bit operations.

These kits usually include complete documentation allowing a student to go from soldering to assembly language programming in a single course. It can also accept a second processor, allowing a limited form of multi-processor operation where both processors run simultaneously and independently. The later iPDS is a portable unit, about 8″ x 16″ x 20″, with a handle. Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred.

As in thethe contents of the memory address pointed to by HL can be accessed as pseudo register M. One sophisticated instruction is XTHL, which is used for exchanging the register pair HL with the value stored at the address indicated by the stack pointer.

Intel A Programmable Peripheral Interface

The has extensions to support new interrupts, with three maskable vectored interrupts RST 7. This page was last edited on 16 Wihtat The screen and keyboard can be switched between them, allowing programs to be assembled on one processor large programs took awhile while files are edited in the other. Unlike the microprofessor does not multiplex state signals onto the data bus, but the 8-bit data bus is instead multiplexed with the lower 8-bits of the bit address bus to limit the number of pins to State signals are provided by dedicated bus control signal pins and two dedicated bus state ID pins named S0 and S1.


The is supplied in a pin DIP package.

By using this site, you agree to the Terms of Use and Privacy Policy. More complex operations and other arithmetic operations must be implemented in software. Only a single 5 volt power supply inerfacing needed, like competing processors and unlike the Adding the stack pointer to HL is useful for indexing variables in recursive stack frames.

Views Read Edit View history. Direct copying is supported between any two 8-bit registers and between any 8-bit register and a HL-addressed memory cell, using the MOV instruction.

Intel 8085

The other six registers can be used as independent byte-registers or as three bit register pairs, BC, DE, and HL or B, D, H, as referred to in Intel documentsdepending on the particular instruction. Later an external box was made available with two more floppy drives.

These are intended to be supplied by external hardware in order to invoke a corresponding interrupt-service routine, but are also often employed as fast system calls.

The sign flag is set if the result has a negative sign i. All interrupts are enabled by the EI instruction and disabled by the DI instruction. All data, control, and address signals are available on dual pin headers, and a large prototyping area is provided. Operations that have to be implemented by program code subroutine libraries include comparisons of signed integers as well as multiplication and division.

The original development system had an processor.

Software simulators are available for the microprocessor, which allow simulated execution of opcodes in a graphical environment. A NOP “no operation” instruction exists, but does not modify any of the registers or flags. The same microproceesor not true of the Z