Special features of Z-80

Microprocessor 8085

In this section we will see some advanced features of Zilog Z-80 Microprocessor. These features are basically compared to the Intel 8085 Microprocessor.

The features are listed below −

Sr.No.	Features & Description
1	Opcode Count In this Microprocessor there are 698 Opcodes of different lengths.
2	Instruction Length The instructions can be divided into four categories according to their lengths. There are 202 of 1-byte instructions, 344 of 2-byte instruction 74 of 3-byte instruction 78 of 4-byte instruction
3	Opcode Length The instructions can also be divided into two parts according to the opcode length. In the instruction set, there are instructions with 1-byte opcode and 2-byte opcode. The number of 1-byte opcode instruction is 252, and number of 2-byte opcode instruction is 446
4	New addressing modes, compared to 8085 Like 8085, it has different addressing modes, but here some additional addressing modes are also available. These addressing modes are, Indexed Addressing Mode Relative Addressing Mode Bit Addressing Mode
5	New Instructions, compared to 8085 In 698 instructions, there are many instructions, which are different from the 8085. The instruction types are like these, Block Move Block Search Different I/O instructions Different Exchange Instructions Decimal adjustment instructions after Addition and Subtraction Looping instructions Different Shift and Rotate Instruction Direct Memory Access type instruction
6	Interrupt Structure In Z-80 there are powerful interrupt structure compared to 8085 Microprocessor.

Chandu yadav

Updated on: 30-Jul-2019

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