Command Word of Programmable Communication Interface PIC 8251 Universal Synchronous or Asynchronous

TL;DR

The 8251 is a programmable communication interface that acts as a mediator between microprocessors and peripheral devices, converting parallel data to serial data, and vice versa.

Transcript

hello friends in this video we will study the command instruction format of the 8251 programmable communication interface which is sometimes also known as the universal synchronous asynchronous receiver transmitter or usa rt so let us start with our topic the 825 fund which is the programmable communication interface it is used as an interface or w... Read More

Key Insights

• 🛟 The 8251 Programmable Communication Interface serves as an interface between microprocessors and peripheral devices, converting between parallel and serial data.
• 🎮 Command instructions written by the microprocessor into the control register determine the operations of the 8251.
• 😫 The command instruction format consists of 8 bits, each representing a specific function, such as enabling or disabling the transmitter and receiver, setting output signals, and performing internal resetting.
• 🍳 The 8251 can send break characters, reset error flags, and enter hunt mode.

Questions & Answers

Q: What is the role of the 8251 Programmable Communication Interface?

The 8251 acts as an interface between microprocessors and peripheral devices, converting parallel data to serial data for transmission and vice versa for reception.

Q: How does the microprocessor control the operations of the 8251?

The microprocessor sends command instructions to the 8251 by writing them into the control register, specifying functions such as enabling or disabling the transmitter and receiver, setting output signals, resetting error flags, and entering hunt mode.

Q: What are some functions controlled by the command instruction?

The command instruction controls functions such as enabling or disabling the transmitter and receiver, setting output signals like data terminal ready and request to send, resetting error flags, sending break characters, and enabling hunt mode.

Q: How is the command instruction format structured?

The command instruction format consists of 8 bits in the control register. Each bit represents a specific function, such as enabling transmitting operation (D0), setting data terminal ready (DTR), enabling the receiver (RXE), sending break characters (SBR), resetting error flags (ER), activating request to send (RTS), internal resetting (IR), and enabling hunt mode (DXEN).

Summary & Key Takeaways

• The 8251 Programmable Communication Interface converts parallel data to serial data and vice versa, acting as an interface between microprocessors and peripheral devices.

• The microprocessor sends command instructions to the 8251 to determine its operations, such as enabling or disabling the transmitter and the receiver section, setting output signals, resetting error flags, sending break characters, and enabling hunt mode.

• The command instruction format of the 8251 consists of 8 bits in the control register, each bit representing a specific function.