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PC87109VBE Datasheet

  • PC87109VBE

  • PC87109VBE Advanced UART and Infrared Controller

  • 380.72KB

  • 56頁

  • NSC

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PC87109VBE Advanced UART and Infrared Controller
Preliminary
November 1997
PC87109VBE Advanced UART and Infrared Controller
General Description
The PC87109 is a serial communication device with
infrared capability. It supports 6 modes of operation and is
backward compatible with the 16550 and 16450 (except for
the MODEM control functions). The operational modes are:
UART, Sharp-IR, IrDA 1.0 SIR, IrDA 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
compatibility 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
communications work in half duplex fashion.
To further ease driver design and simplify the
implementation of infrared protocols, a 12-bit timer with 125碌s
resolution has also been included.
Features
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Compatible with 16550 and 16450 devices
Extended UART mode
Sharp-IR with selectable internal or external
modulation
IrDA 1.0 SIR with up to 115.2 Kbaud data rate
IrDA 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 compatibility 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 package
Block Diagram
SO UT
UART Module
IRQ
DRQ
DACK
TC
A0-A3
DMA Request
Control
Interrupt
Request
Control
SI N
PC87109 Core
Sharp-IR Module
DASK
IrDA 1.0 Module
115.2 Kbps
SI R
IrDA 1.1 Module
0.576 & 1.152 Mbps
MIR
IrDA 1.1 Module
4.0 Mbps
FIR
To IR Transceivers
Configuration
Registers
D0-D7
8 Bit Data Bus
Consumer Electronics IR Module
CEIR
TRI-STATE
廬
is a registered trademark of National Semiconductor Corp.
WATCHDOG鈩?is a trademark of National Semiconductor Corp.
漏 1997 National Semiconductor Corporation
1
www.national.com

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