Intel 8080 Microprocessor

Topics: Microprocessor, Intel 8080, Computer Pages: 6 (1810 words) Published: June 9, 2013
Introduction to Computer
Architectures

~Intel 8080~

-Technical Report-

Examination number: Y8138573

Table of contents:
1 Introduction......................................................................................................3 2.1 General information.................................................................................................3 2 General architecture and structure…………………………………………….4 3.2 Registers……………………………………………………………………………………………..4 3.3 Stack Operation…………………………………………………………………………………..4 3.4 Left space of input-output…………………………………………………………….……..5 3.5 Internal state word……………………….…………………………………………………….5 3.6 Pin usage…………………………………………………………………………………………….5 3 Programming the 8080………………………………………………………………6 4.7 Internal architecture...............................................................................................6 4.8 8-bit instructions…………………………………………………………………………..……6 4.9 16-bit instructions……………………………………………………………………..……….7 4 Conclusions………………………………………………………………………….…….7 5 References………………………………………………………………..………………..8

1 Introduction:

At their birth microprocessors came with extravagant claims that later proved to be appropriate. Such a claim was: “The microprocessor represents truly low-cost computing . Its economics are so compelling that microcomputers are serving not only in many applications where computing power was previously too costly but also in applications where . . . computer control was formerly unthinkable” [1] which shows us that the microprocessor was built as the cheapest and most accessible tool for solving programmable problems, microprogramming being considered “the best way to design an automatic calculating machine” [2] as Maurice Wilkes stated in a conference in 1951. The first 8-bit microprocessor, INTEL 8008, had a simplistic architecture and was rapidly replaced by INTEL 8080 which also gave rise to other faster and more capable microprocessors.

1.1 General information:

The INTEL 8080, released in March of 1974 and created by Federico Faggin, Masatoshi Shima and Stan Mazor,powered traffic lights, was also used in the first widely-known personal computer ( Altair 8800, named allegedly for a destination of the Starship Enterprise from the Star Trek TV show) and the first microprocessor that was widely accepted. The leader design, Federico Faggin bragging by saying that “The 8080 really created the microprocessor market. The 4004 and 8008 suggested it, but the 8080 made it real”. The 8080 has an 8 bit data bus, a 16 bit address bus, seven 8 bit registers, a 16 bit stack pointer to memory replacing the 8 level internal stack on the 8008, a 16 bit program counter and also 256 I/O ports. The change from the 18-pin IC package on the 8008 to the 40-pin one allows it to access data faster as the address and the data can be presented in the same time. The stack previously stored in the processor is changed into Stack Pointer(SP) register which is stored in the RAM so no longer limited in space. In comparison with the 8008, the 8080 can load and store the accumulator and other registers via direct addressing and also contains some 16-bit instructions executable only for certain combinations of registers but is still categorizes as an 8-bit machine as most of the operations are performed with the 8-bit accumulator. The INTEL 8080 microprocessor was very popular and clones of it were made in USSR, Poland, CSSR, Hungary and Romania. Some other computers which used it: IMSAI 8080, CompuColor II, Byte Computers Byt-8.

2 General architecture and structure:

2.1 Registers:

The accumulator or the A register is an 8-bit register which is used for arithmetical, logical, I/O and load/store operations and in the 8080 can be loaded and stored via direct addressing. The flag is an 8-bit register which consists of five 1-bit flags: sign (most significant bit of the...

References: [1] | G. Byblinsky, „"Here Comes The Second Computer Revolution",” Fortune, vol. XCII, nr. 5, 1975. |
[2] | M
[7] | J. W. Coffron, Understanding and Troubleshooting the Microprocessor, Englewood Cliffs, New Jersey: PRENTICE-HALL, INC., 1980. |
[8] | „CPU World,” [Interactiv]
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay on Evolution of Microprocessor
  • Microprocessor Essay
  • Intel Processors Essay
  • NT1110: Intel processors Essay
  • Evolution of Microprocessor Essay
  • Intel Branding Strategy Case Essay
  • X86 and Intel Essay
  • Intel vs Amd Essay

Become a StudyMode Member

Sign Up - It's Free