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The Zilog Z80 is an 8-bit microprocessor designed by Zilog that played an important role in the evolution of early computing. Software-compatible with the Intel 8080, it offered a compelling alternative due to its lower cost and increased performance.
- LIFE SUPPORT POLICY
- As used herein
- Revision History
- Arithmetic Logic Unit
- Instruction Register and CPU Control
- Input or Output Cycles
- Bus Request/Acknowledge Cycle
- HALT Exit
- Interrupt Response
- Software Implementation Examples
- Example 4
- Instruction Types
ZILOG’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF ZILOG CORPORATION.
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Each instance in the following revision history table reflects a change to this document from its previous version. For more details, refer to the corresponding pages provided in the table.
The 8-bit arithmetic and logical instructions of the CPU are executed in the Arithmetic Logic Unit (ALU). Internally, the ALU communicates with the registers and the external data bus by using the internal data bus. Functions performed by the ALU include: Add Subtract Logical AND Logical OR Logical exclusive OR Compare Left or right shifts or rotat...
As each instruction is fetched from memory, it is placed in the Instruction Register and decoded. The control sections performs this function and then generates and supplies the control signals necessary to read or write data from or to the registers, control the ALU, and provide required external control signals.
Figure 7 shows an I/O read or I/O write operation. During I/O operations, a single wait state is automatically inserted. The reason for this single wait state insertion is that during I/O operations, the period from when the IORQ signal goes active until the CPU must sample the WAIT line is short. Without this extra state, sufficient time does not ...
Figure 8 shows the timing for a Bus Request/Acknowledge cycle. The BUSREQ signal is sampled by the CPU with the rising edge of the most recent clock period of any machine cycle. If the BUSREQ signal is active, the CPU sets its address, data, and tristate control signals to the high-impedance state with the rising edge of the next clock pulse. At th...
When a software HALT instruction is executed, the CPU executes NOPs until an interrupt is received (either a nonmaskable or a maskable interrupt while the interrupt flip-flop is enabled). The two interrupt lines are sampled with the rising clock edge during each T4 state as depicted in Figure 11. If a nonmaskable interrupt is received or a maskable...
An interrupt allows peripheral devices to suspend CPU operation and force the CPU to start a peripheral service routine. This service routine usually involves the exchange of data, status, or control information between the CPU and the peripheral. When the service routine is completed, the CPU returns to the operation from which it was interrupted.
The Z80 instruction set provides the user with a large number of operations to control the Z80 CPU. The main alternate and index registers can hold arithmetic and logical opera-tions, form memory addresses, or act as fast-access storage for frequently used data. Information can be moved directly from register to register, memory to memory, memory t...
One number is to be subtracted from another number, both of which exist in packed BCD format and are of equal but varying length. The result is stored in the location of the minu-end. The operation is programmed as follows: LD LD LD HL, ARG1 DE, ARG2 B, LENGTH AND A SUBDEC:LD A, (DE) ;ADDRESS OF MINUEND ;ADDRESS OF SUBTRAHEND ;LENGTH OF TWO ARGUMEN...
The load instructions move data internally among CPU registers or between CPU registers and external memory. All of these instructions specify a source location from which the data is to be moved, and a destination location. The source location is not altered by a load instruction. Examples of load group instructions include moves between any of th...
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Apr 22, 2024 · Last week, chip manufacturer Zilog announced that after 48 years on the market, its line of standalone DIP (dual inline package) Z80 CPUs is coming to an end, ceasing sales on June 14, 2024.
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Apr 30, 2024 · April 30, 2024 by Duane Benson. Two years short of the Z80's 50th birthday, Zilog has called it curtains on the 8-bit MPU. What legacy does this microprocessor leave behind? As of June 2024, the venerable Z80 microprocessor, released by Zilog in 1976, will no longer be available as a standalone part. Zilog Z80 die, date code 1990.
- Duane Benson
Jun 30, 2017 · Chip Hall of Fame: Zilog Z80 Microprocessor - IEEE Spectrum. History of Technology Article. Another legend from the 8-bit era, this processor powered the first portable computer as well as the beloved “Trash-80” IEEE Spectrum. 30 Jun 2017. 1 min read. Image: Computer History Museum. Z80 Micro-processor. Manufacturer: Zilog. Category: Processors.
- IEEE Spectrum
Apr 19, 2024 · Hardware. Tech Culture. cpu. gaming. The legendary Zilog Z80 CPU is being discontinued after nearly 50 years. The microprocessor was used in countless consoles, arcade machines, and embedded...
The ZiLOG Z80 CPU family of components are fourth-generation enhanced microprocessors with exceptional computational power. They offer higher system throughput and more efficient memory utilization than comparable second- and third-generation microprocessors. The speed offerings from 6–20 MHz suit a wide range of applications which
