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| About site: http://www.ee.washington.edu/circuit_archive/micro/z80.html |
Title: Hardware/Components/Processors/Z80 - Zilog Z80 8-Bit Microprocessor Brief: technical description, diagrams, pin-out and signals, specifications. [University of Washington, Electrical Engineering, Circuits Archive]
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Zilog Z80 8-Bit MicroprocessorZilog Z80 8-Bit Microprocessor (The following discussion is for informational purposes only. Z80 and the Z80 assembly language are trademarks of ZILOG, Inc.)These materials are provided as-is, with no support. They are not being maintained. At present they are being kept available because we're aware people still refer to them - but we reserve the right to remove this archive, without notice, at any time.DESCRIPTION The Z80 microprocessor is an 8 bit CPU with a 16 bit address buscapable of direct access of 64k of memory space. It has a languageof 252 root instructions and with the reserved 4 bytes as prefixes,acceses an additional 308 instructions. The Z80 was modeled after the8088 and contains the 78 - 8088 opcodes as a subset to it's language. Programming features include an accumulator and six eight bit registersthat can be paired as 3-16 bit registers. In addition to the generalregisters, a stack-pointer, program-counter, and two index (memory pointers)registers are provided. While not in the same leauge as the 80486 or68000 series, the Z80 is extremely useful for low cost controlapplications. One of the more useful features of the Z80 is the built-inrefresh circuitry for ease of design with DRAMs. The Z80 comes in a 40 pin DIP package. It has been manufacturedin A, B, and C models, differing only in maximum clock speed. It alsohas been manufactured as a stand-alone microcontroler with variousconfigurations of on-chip RAM and EPROM. OTHER DEVICE NUMBERS D780C (NEC)PIN-OUT AND SIGNAL DESCRIPTION Pin # Signal (active high unless noted) 1 A11 2 A12 3 A13 {Address bus} 4 A14 5 A15 6 CLK (clock, rising edge trig) 7 D4 8 D3 9 D5 {Data bus} 10 D6 11 +5 VDC 12 D2 13 D7 14 D0 15 D1 16 INT (Interupt Request) 17 NMI (Non-maskable Interupt Request) 18 HALT (Active low) 19 MREQ (Memory Request, active low) 20 IORQ (I/O Request, active low) 21 RD (Read, active low) 22 WR (Write, active low) 23 BUSAK (Bus Request Acknowloegmnet, active low) 24 WAIT 25 BUSRQ (Bus Request) 26 RESET 27 MI (Maskable interupt, active low). 28 REFSH (Refresh timing, active low) 29 GND 30 A0 31 A1 32 A2 33 A3 34 A4 35 A5 36 A6 37 A7 38 A8 39 A9 40 A10DEVICE SPECIFICATIONS Max. Clock Speed: Z80 - 2.5MHz, Z80A - 4MHz Power Requirements: Z80 - 5V@60mA, Z80A - 5V@90mA Operating Temp: 0 - 70 deg C. Min. Instruction time: 1uS (@4MHz) Max. Instruction time: 5.75uS (@4MHz) No. of Instructions: 158 (78 instructions of 8088 are a subset) Internal Registers: 14 Stack: RAMThis information compiled by Robert Wenzlaff, rwenzlaff@delphi.com |
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Brief: | technical | description, | diagrams, | pin-out | and | signals, | specifications. | [University | of | Washington, | Electrical | Engineering, | Circuits | Archive] |
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http://www.ee.washington.edu/circuit_archive/micro/z80.html
Zilog Z80 8-Bit Microprocessor 2008 October
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Brief: technical description, diagrams, pin-out and signals, specifications. [University of Washington, Electrical Engineering, Circuits Archive]
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