PC16552DVX/NOPB Dual UART IC with 16-Byte FIFO for Bluetooth and Serial Communication
The PC16552DVX/NOPB is a dual UART IC with independent serial channels and 16-byte FIFO buffers, reducing CPU overhead. It supports programmable baud rates, DMA signaling, and MODEM control. Ideal for Bluetooth and industrial serial applications, it offers reliable data transfer and error detection.
PC16552DVX/NOPB UART Interface ICs ASYNCHRON RCVR/TRANS W/ FIFO
General Description
The PC16552D is a dual version of the PC16550D Universal Asynchronous Receiver Transmitter (UART) The two serial channels are completely independent except for a common CPU interface and crystal input On power-up both channels are functionally identical to the 16450 Each channel can operate with on-chip transmitter and receiver FIFOs (FIFO mode) to relieve the CPU of excessive software overhead In FIFO mode each channel is capable of buffering 16 bytes (plus 3 bits of error data per byte in the RCVR FIFO) of data in both the transmitter and receiver All the FIFO control logic is on-chip to minimize system overhead and maximize system efficiency
Signalling for DMA transfers is done through two pins per
channel (TXRDY and RXRDY) The RXRDY function is mul-
tiplexed on one pin with the OUT 2 and BAUDOUT func- tions The CPU can select these functions through a new register (Alternate Function Register)
Each channel performs serial-to-parallel conversion on data characters received from a peripheral device or a MODEM and parallel-to-serial conversion on data characters re- ceived from the CPU The CPU can read the complete status of each channel at any time Status information re- ported includes the type and condition of the transfer opera- tions being performed by the DUART as well as any error conditions (parity overrun framing or break interrupt)
The DUART includes one programmable baud rate genera- tor for each channel Each is capable of dividing the clock input by divisors of 1 to (216 b 1) and producing a 16 c clock for driving the internal transmitter logic Provisions are also included to use this 16 c clock to drive the receiver logic The DUART has complete MODEM-control capability and a processor-interrupt system Interrupts can be pro- grammed to the user’s requirements minimizing the com- puting required to handle the communications link
The DUART is fabricated using National Semiconductor’s advanced M2CMOSTM
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