PC16550D Overview
The PC16550D device is an improved version of the original 16450 Universal Asynchronous Receiver/Transmitter (UART). Functionally identical to the 16450 on powerup (CHARACTER mode: can also be reset to 16450 Mode under software control) the PC16550D can be put into an alternate mode (FIFO mode) to relieve the CPU of excessive software overhead.
PC16550D Key Features
- 1 Capable of Running All Existing 16450 Software
- Pin for Pin patible With the Existing 16450 Except for CSOUT (24) and NC (29). The Former CSOUT and NC Pins Are TXRDY an
- After Reset, All Registers Are Identical to the 16450 Register Set
- In the FIFO(1) Mode Transmitter and Receiver Are Each Buffered With 16 Byte FIFO’s to Reduce the Number of Interrupts Pr
- Adds or Deletes Standard Asynchronous munication Bits (Start, Stop, and Parity) to or From the Serial Data
- Holding and Shift Registers in the 16450 Mode Eliminate the Need for Precise Synchronization Between the CPU and Serial
- Independently Controlled Transmit, Receive, Line Status, and Data Set Interrupts
- Programmable Baud Generator Divides Any Input Clock by 1 to (216
- 1) and Generates the 16 × Clock
- Independent Receiver Clock Input
