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Z80

241 bytes removed, 06:44, 1 September 2024
/* Description */
The Z80 microprocessor is an 8 bit [[CPU]] with a 16 bit address bus capable of direct access to 64k of memory space. It has a language of 252 root instructions and with the reserved 4 bytes as prefixes, access to an additional 308 instructions. The Z80 was modelled after the [[8080]] and contains the seventy-eight 8080 opcodes as a subset to its language.
Programming features include an accumulator and six 8-bit registers that can be paired as three 16-bit registers. In addition to the general registers, a stack pointer, program counter, and two index (memory pointer) registers are provided. While not in the same league as the Intel 80x86 or the [[Motorola 68000]] series, the Z80 is extremely useful for low cost control applications. One of the more useful features of the Z80 is the built-in refresh circuitry for ease of design with DRAMs.
The Z80 comes in a 40 pin DIP package. It has been manufactured in A, B, and C models, differing only in maximum clock speed. It also has been manufactured as a stand-alone microcontroller with various configurations of on-chip RAM and EPROM.
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