Z80 instruction set

For the R, it is an even more complex story: The ED series are a mixed set of extensions prominently featuring the block move instructions: The compatible registers [32] are:. Unlike the , the Z80 can jump to a relative address jr instead of jp using a signed 8-bit displacement. Note that the assembled code is binary-compatible with the Intel and CPUs.

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The is a Hitachi-supplied Z80 core with numerous on-chip "extras". Milpitas, CaliforniaUnited States: On MSX, it takes 10 two more.

Z80 instruction set - ClrHome

Like the refresh register, this register has also sometimes been used creatively; in interrupt modes 0 and 1 or in a system not using interrupts it can be used as simply another 8-bit data register. Finally, the Z has several new single-byte opcodes: This also applies to rst.

This long M1-signal relative to the clock also meant that the Z80 could employ about times the internal frequency of aor similar using the same type of memory.

At Fairchild Instrutcionand later at IntelFaggin had been working on fundamental transistor and semiconductor manufacturing technology. The Rabbit parts are based closely on the Zilog Z architecture, although they are not binary compatible with the Zilog parts.

8080/Z80 Instruction Set

The also introduced the important 8-bit immediate data mode for accumulator operations and immediate bit data for HL, BC and DE loads. The free software catalog and directory. The Z80 orthogonalized this a bit further by making all bit register pairs including IX and IY more general purpose, with bit copying directly to and from memory. To perform an equivalent loop on an would require separate decrement and jump to a two-byte absolute address instructions, and the flag register would be altered.

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Instruction set Legend Wait cycles Instruction set Filter: The ED series are a mixed set of extensions prominently featuring the block move instructions: The interrupt vector registerIis used for the Z80 specific mode 2 interrupts selected by the IM 2 instruction. But, as those of us who've used undocumented opcodes know, you can never add without taking.

A quick way to detect if code insyruction running on an or a Z80 is to use the difference in the way the parity flag behaves: Officially, they were treated as bit only.

If you're looking to port Z code to there is a relatively short list of things to watch out for:.

The Zilog documentation further groups instructions into the following categories:. The result i've been comparing were carry and resulting accumulator.

MSX Assembly Page

A result of a regular encoding common with the is that each of the 8-bit registers can be loaded from themselves e. Retrieved April 4, This section needs additional citations for verification. As on the8-bit registers are typically paired to provide bit versions.

Z80 rotate instructions clear the A C flag, but the does not. This scheme gives the Z80 a large number of permutations of instructions and registers; Zilog categorizes these into different "instruction types", 78 of which are the same as those of the Intel [40] allowing operation of most programs on a Z Single-board microcontroller Special function register. Intel Component Data Catalog The dedicated M1-signal machine cycle one in the Z80 can be used to allow memory chips the same amount of access time for instruction fetches as for data access, i.

The Zilog Z80 was a software-compatible extension and enhancement of the Intel and, like it, was mainly aimed at embedded systems.

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