Interface circuit: A logic circuit that connects between computers, between a computer and peripheral devices, and between internal components of the computer. The interface circuit is a bridge for information exchange between the CPU and external devices.
The input and output interface circuits are also called I/O circuits (INPUT/Output), which are commonly referred to as adapters, adapter cards or interface cards. It is a bridge between microcomputers and external devices to exchange information.
(1) Interface circuit structure: generally consists of a register group, a dedicated memory and a control circuit. The current control commands, communication data, and status information of external devices are stored in dedicated memory or register groups.
(2) Connection of interface circuit: All external devices are connected to the system bus of the microcomputer through their respective interface circuits.
(3) Communication method: divided into parallel communication and serial communication. Parallel communication is the simultaneous transmission of data bits; serial communication allows data to be transmitted one bit at a time.
Classification of interface circuitsThe fixed single port address decoding is decoded by a gate circuit or a decoder, and the port address cannot be changed after the design is completed.
The optional port address decoding consists of a comparator and a decoder, and the port address can be changed by the DIP switch.
Implementing logic circuits with programmable logic arrays
Fixed single port address decoding (1)
Fixed single port address decoding (2)
Fixed single port address decoding (3)
3-8 decoder decoding circuit
What are the forms of the interface circuit?1. Fixed structure: SSI, MSI (IC)
2, semi-fixed structure: GAL, PAL
3, programmable structure: programmable chip
4, intelligent structure: with a microprocessor
Interface circuit function The main functions of the interface circuit are level connection and impedance matching. Sometimes there are simple signal processing or "maintenance", electrostatic protection, AC and DC isolation and so on.
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