PC87109VBE Datasheet | National Semiconductor

PC87109VBE Advanced UART and Infrared Controller Preliminary November 1997 PC87109VBE Advanced UART and Infrared Controller General Description The PC87109 is a serial munication device with infrared capability. It supports 6 modes of operation and is backward patible with the 16550 and 16450 (except for the MODEM control functions). The operational modes are: UART, Sharp-IR, Ir DA 1.0 SIR, Ir DA 1.1 MIR and FIR, and Consumer Electronics IR (also referred to as TV Remote or Consumer Remote Control). In order to support existing legacy software based upon the 16550 UART, the PC87109 provides a special fallback mechanism that automatically switches the device to 16550 patibility mode when the baud generator divisor is accessed through the legacy ports in bank 1. The device architecture has been optimized to meet the requirements of a variety of UART and infrared based applications. DMA support for all operational modes has been incorporated into the architecture. The device uses one DMA channel. One channel is required for infrared based applications since infrared munications work in half duplex fashion. To further ease driver design and simplify the implementation of infrared protocols, a 12-bit timer with 125µs resolution has also been included. Features s s s s s s s s s s s s s s s s s patible with 16550 and 16450 devices Extended UART mode Sharp-IR with selectable internal or external modulation Ir DA 1.0 SIR with up to 115.2 Kbaud data rate Ir DA 1.1 MIR and FIR with 0.576, 1.152 and 4.0 Mbps data rates Consumer Electronics IR mode UART mode data rates up to 1.5 Mbps Back-to-Back infrared frame transmission and reception Full duplex infrared frame transmission and reception Transmit deferral Automatic fallback to 16550 patibility mode Selectable 16 or 32 level FIFOs 12-bit timer for infrared protocol support Programmable IRQ and DMA signals polarity Support for power management 5V or 3.3V operation with back drive protection 32-pin TQFP...