Z80 Microprocessor Architecture

1- The MOS Technology 6501 microprocessor chip has 13 address lines. Spec­ify the memory registers it is capable of addressing. 2- If the Intel 8086 microprocessor has 20 address lines, what is its capacity of memory addressing? 3- Explain the functions of the accumulator. 4- List the Z80 programmable registers. 5- What is a flag? […]
Continue reading…

· The Z80 signals can be classified into six groups: address bus, data bus, con­trol signals, external requests, request acknowledge, and power and frequency signals (see section 1 for definitions of these signals). · The Z80 address bus has 16 unidirectional address lines; they are capable of addressing 64K memory. · The Z80 data bus […]
Continue reading…

The primary reasons to discuss other 8-bit microprocessors are to examine how the MPU model developed in the last topic matches with various microproces­sors and to confirm that the underlying basic concepts remain similar even though specific details may vary from one chip to another. At present. many 8-bit general-­purpose microprocessors are available in the […]
Continue reading…

After reading the previous sections. the reader may have many unanswered ques­tions. One of the primary reasons for this predicament is that the microprocessor is a programmable and complex device. It interacts with external devices such as memory and I/Os. and some questions cannot be answered until we discuss these other devices. Similarly. some questions […]
Continue reading…

After examining the concepts summarized at the end of the previous section, we may need to generate additional control signals. 1. To read from memory, the M͞R͞E͞Q and the R͞D signals are necessary, and to read from an input device, the I͞O͞R͞Q and the R͞D are necessary; all these sig­nals are active low. As a […]
Continue reading…

MACHINE CYCLES AND BUS TIMINGS The Z80 microprocessor is designed to execute 158 different instruction types. Each instruction has two parts: operation code (known as opcode) and operand. The opcode is a command such as Add, and the operand IS an object to be oper­ated on, such as a byte or the contents of a […]
Continue reading…

Z80 Microprocessor Architecture The Z80 is one of the most versatile and widely used 8-bit microprocessors, and many micro­processor-based systems are designed around the Z80. The Z80 chip includes most of the logic circuitry for performing computing tasks and necessary bus signals. This topic discusses the Z80 architecture in terms of the generalized MPU discussed […]
Continue reading…