8051 microcontrollers

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 in the previous topic . This topic describes the Z80 hardware model; it shows logic pinout of the chip and classifies the signals in various groups accord­ing to their functions. Similarly, the topic in­cludes a brief description of programming reg­isters and flags. The hardware model lists the operations the Z80 frequently performs and describes how the Z80 communicates with mem­ory and I/Os by using various buses. These op­erations are illustrated in terms of machine cycles and logic levels of the buses in relation to the system clock. Finally, the topic includes the discus­sion of similar 8-bit microprocessors in te...