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In computer architecture, 8-bitintegers, memory addresses, or other data units are those that are 8 bits (1 octet) wide. Also, 8-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. '8-bit' is also a generation of microcomputers in which 8-bit microprocessors were the norm.
- Quad, 8-Bit, 100 MSPS, Serial LVDS 1.8 V ADC Data Sheet AD9287 FEATURES 4 ADCs integrated into 1 package 133 mW ADC power per channel at 100 MSPS. SNR = 49 dB (to Nyquist) ENOB = 7.85 bits. SFDR = 65 dBc (to Nyquist) Excellent linearity P. DNL = ±0.2 LSB (typical) INL = ±0.2 LSB (typical) Serial LVDS (ANSI -644, default).
- SOIC (20) 12.80 mm × 7.50 mm TPIC6B595 PDIP (20) 24.33 mm × 6.35 mm This device contains an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage (1) For all available packages, see the orderable addendum at the end of the data sheet. Data transfers through the shift and storage.
- 7/16' - 5/8' 11/16' - 1' Black & Decker Bullet pilot-point bits. 1/8' - 3/16' 1/4' - 3/8' 1/2' 3000 3000 3000 1500 2400 1600 2000 1500 1500 1000 750 2000 1200 Good all-around bit. These cut more quickly than brad points and twist drills. Brad-point bits. 1/8' 1/4' 3/8' 1/2' 5/8' 3/4' 3/8' 1' 1800 1800 1800 1800 1800 1400 1200 1000 1200 1000 750.
2.7 V to 5.5 V, 200 kSPS 8-Bit Sampling ADC FUNCTIONAL BLOCK DIAGRAM CLOCK OSC CHARGE REDISTRIBUTION DAC THREE-STATE DRIVERS CONTROL LOGIC BUSY CS RD CONVST VIN VDD AGND VREF DB7 DB0 COMP T/H AD7819 FEATURES 8-Bit ADC with 4.5 s Conversion Time On-Chip Track and Hold Operating Supply Range: 2.7 V to 5.5 V Specifications at 2.7 V – 3.6 V and 5. 8-Bit, High Speed, Multiplying D/A Converter Data Sheet DAC08 Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result f rom its use.
The term '8-bit' is also applied to the character sets that could be used on computers with 8-bit bytes, the best known being various forms of extended ASCII, including the ISO/IEC 8859 series of national character sets – especially Latin 1 for English and Western European languages.
The IBM System/360 introduced byte-addressable memory with 8-bit bytes, as opposed to bit-addressable or decimal digit-addressable or word-addressable memory, although its general purpose registers were 32 bits wide, and addresses were contained in the lower 24 bits of those addresses. Different models of System/360 had different internal data path widths; the IBM System/360 Model 30 (1965) implemented the 32-bit System/360 architecture, but had an 8 bit native path width, and performed 32-bit arithmetic 8 bits at a time.[1]
The first widely adopted 8-bit microprocessor was the Intel 8080, being used in many hobbyist computers of the late 1970s and early 1980s, often running the CP/Moperating system; it had 8-bit data words and 16-bit addresses. The Zilog Z80 (compatible with the 8080) and the Motorola 6800 were also used in similar computers. The Z80 and the MOS Technology 6502 8-bit CPUs were widely used in home computers and second- and third-generation game consoles of the 1970s and 1980s. Many 8-bit CPUs or microcontrollers are the basis of today's ubiquitous embedded systems.
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Details[edit]
There are 28 (256) different possible values for 8 bits. When unsigned, it has possible values ranging from 0 to 255; when signed, it has -128 to 127.
Eight-bit CPUs use an 8-bitdata bus and can therefore access 8 bits of data in a single machine instruction. The address bus is typically a double octet wide (i.e. 16-bit), due to practical and economical considerations. This implies a direct address space of only 64 kB on most 8-bit processors.
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Notable 8-bit CPUs[edit]
The first commercial 8-bit processor was the Intel 8008 (1972) which was originally intended for the Datapoint 2200intelligent terminal. Most competitors to Intel started off with such character oriented 8-bit microprocessors. Modernized variants of these 8-bit machines are still one of the most common types of processor in embedded systems.
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Pastello 1 1 11. Another notable 8-bit CPU is the MOS Technology 6502; it, and variants of it, were used in a number of personal computers such as the Apple I and Apple II, the Atari 8-bit family, the BBC Micro, and the Commodore PET and Commodore VIC-20, and in a number of video game consoles such as the Atari 2600 and the Nintendo Entertainment System.
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Manufacturer | Processor | Year | Comment |
---|---|---|---|
Intel | 8008 | 1972 | Datapoint 2200 compatible |
Signetics | 2650 | 1973 | |
Intel | 8080 | 1974 | 8008 source compatible |
Motorola | 6800 | 1974 | |
Fairchild | F8 | 1975 | |
MOS | 6502 | 1975 | Similar to 6800, but incompatible |
Microchip | PIC | 1975 | Harvard architecture microcontroller |
Electronic Arrays | EA9002 | 1976 | 8-bit data, 12-bit addressing |
RCA | 1802 | 1976 | |
Zilog | Z80 | 1976 | 8080 binary compatible |
Intel | 8085 | 1977 | 8080 binary compatible |
Zilog | Z8 | 1978 | Harvard architecture microcontroller |
Motorola | 6809 | 1978 | 6800 source compatible |
Intel | 8051 | 1980 | Harvard architecture microcontroller |
Motorola | 68008 | 1982 | 32-bit registers, 20-bit or 22-bit addressing, three 16-bit ALUs, 8-bit data bus; Motorola 68000 software-compatible, 6809 hardware-compatible |
MOS | 6510 | 1982 | Enhanced 6502 custom-made for use in the Commodore 64 |
Ricoh | 2A03 | 1982 | 6502 clone minus BCD instructions for the Nintendo Entertainment System |
Zilog | Z180 | 1985 | Z80 binary compatible |
Motorola | 68HC11 | 1985 | |
Atmel | AVR | 1996 | |
Zilog | EZ80 | 1999 | Z80 binary compatible |
Infineon | XC800 | 2005 | |
Freescale | 68HC08 | ||
Hudson | HuC6280 | 65C02 binary compatible | |
Motorola | 6803 | ||
NEC | 78K0[2] |
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References[edit]
- ^Amdahl, G. M.; Blaauw, G. A.; Brooks, F. P. (1964). 'Architecture of the IBM System/360'(PDF). IBM Journal of Research and Development. 8 (2): 87–101. doi:10.1147/rd.82.0087. Archived(PDF) from the original on 2017-08-10.
- ^'NEC 78K0'. NEC. Archived from the original on 2008-10-28. Retrieved 2009-02-10.
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