MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -Explanation: The data bus buffer is controlled by read/write control logic. Explanation: RD(ACTIVE LOW), WR(ACTIVE LOW), A1, A0, RESET are the inputs provided by the microprocessor to the read/write control logic of 8255.

Detailed explanation-2: -The 8-bit data bus buffer is controlled by the read/write control logic. The read/write control logic manages all of the internal and external transfers of both data and control words. and RESET are the inputs provided by the microprocessor to the READ/ WRITE control logic of 8255.

Detailed explanation-3: -The read/write control logic circuit receives a clock signal (CLK) that is used to generate internal device timing. Four control signals are used to govern the read/write operations of the data bus buffer.

Detailed explanation-4: -Read/Write and Control Logic The function of this block is to manage all of the Internal and External transfers of both Data and Control or Status words. It accepts inputs from the CPU Address and Control business and in turn, issues commands to both of the Control Groups. Chip Select.

Detailed explanation-5: -Control Logic: The control logic block accepts control bus signals as well as inputs from the address bus, and issues commands to the individual group control blocks (Group A control and Group B control). It issues appropriate enabling signals to access the required data/control words or status word.