Texas Instruments TL16C750EPFBR

The TL16C750E isa single universal asynchronous receiver transmitter (UART) with 128-byte FIFOs, fractional baudrate support, automatic hardware, software flow control and data rates up to 6 Mbps. The deviceoffers enhanced features such as fractional baud rate and a transmission character control register(TCR) that stores received FIFO threshold level to start or stop transmission during hardware andsoftware flow control automatically without intervention from the CPU.

With the FIFO RDY register, the software gets the status of TXRDY or RXRDY, saving extraGPIO usage. On-chip status registers provide the user with error indications, operational status,and modem interface control. System interrupts may be tailored to meet user requirements. Aninternal loop-back capability allows onboard diagnostics. The TL16C750E incorporates thefunctionality of UART, the UART having its own register set and FIFO.

This version includes the Alternate Function Register (AFR) and this is used to enablesome extra functionality beyond the capabilities of the TL16C750 version. One addition is the IrDAmode, which supports Standard IrDA (SIR) mode with baud rates from 2400 to 115.2 kbps. The thirdaddition is support for RS-485 bus drivers or transceivers by providing an output pin(DTRx) per channel, which is timed to keep the RS-485 driver enabled as longas transmit data is pending.

Another name for the UART function is asynchronous communications element (ACE), andthese terms are used interchangeably. The bulk of this document describes the behavior of each ACE,with the understanding that two such devices are incorporated into the TL16C750E device.