DESCRIPTION
The 28L202 is a high performance functional upgrade for the Philips dual channel UARTS. The SCC2692 and SC26C92 operating at 3.3 or 5 volts supply with added features and deeper partitioned FIFOs. Its configuration on power up is similar that of the SC26C92. Its differences from the SC26C92 are: 256 character receiver, 256 character transmit FIFOs, CRC error detection, 3 and 5 volt compatibility, 8 I/O ports for each UART. IRDA compatibility, arbitrating interrupt system and overall faster buss and data speeds. It is fabricated in an advanced CMOS process that allows stand by current of less that one microampere.

FEATURES
• 3.3 or 5.0 volt operation
• Dual full-duplex independent asynchronous receiver/transmitters
• 256 or larger character FIFOs for each receiver and transmitter
• Power up as 8 bit data no parity one stop bit 9600 baud
• Pin programming (PQFP package) to 68K or 80xxx bus interface
• Programmable data format
   – 5 to 8 data bits plus parity
   – Odd, even, no parity or force parity
   – 1, 1.5 or 2 stop bits programmable in 1/16-bit increments
• 16-bit programmable Counter/Timer
• Programmable baud rate for each receiver and transmitter
   selectable from:
   – 23 fixed rates: 50 to 230.4k baud
   – Other baud rates to MHz at 16X
   – Programmable user-defined rates derived from a
      programmable Counter/timer
   – External 1X or 16X clock
• Parity, framing, and overrun error detection
• False start bit detection
• Line break detection and generation
• Programmable channel mode
   – Normal (full-duplex)
   – Automatic echo
   – Local loop back
   – Remote loop back
   – Multi-drop mode (also called ‘wake-up’ or ‘9-bit’)
• Multi-function 7-bit input port
   – Can serve as clock or control inputs
   – Change of state detection on eight inputs
   – Inputs have typically >100k pull-up resistors
• Multi-function 8-bit output port
   – Individual bit set/reset capability
   – Outputs can be programmed to be status/interrupt signals
• Versatile interrupt system
   – Single interrupt output with eight maskable interrupting
      conditions
   – Output port can be configured to provide a total of up to six
      separate interrupt outputs that may be wire ORed.
   – Each FIFO can be programmed for four different interrupt
      levels.
   – Watch dog timer for each receiver
• Maximum data transfer rates:
   – 1X – 1Mb/sec, 16X – 1Mb/sec
• Automatic wake-up mode for multi-drop applications
• Start-end break interrupt/status
• Detects break which originates in the middle of a character
• On-chip crystal oscillator
• Power down mode
• Receiver time-out mode
• Single +3.3V or +5V power supply
• Powers up to emulate SCC2692 and SC26C92