Overview
The LC82151 is a facsimile controller that integrates the main functions required by facsimile systems on a single chip. The LC82151 includes a FAX modem with ADPCM and HDLC functions, image processing functions that can create high-quality binary image data without external memory, a CODEC accelerator, a CPU and CPU peripheral circuits, general-purpose I/O ports, and other functions. A facsimile system with excellent cost performance characteristics can be created easily by providing ROM and RAM.

Functions
• CPU and peripheral circuits
   – High-speed 16-bit CPU (65C816) operating at 7.4 MHz
   – 16-MB program address space
   – CODEC accelerator
   – Two-channel DMA controller
   – Four 16-bit timers
   – 16-bit watchdog timer
   – TPH interface
   – Serial I/O interface
   – Parallel I/O: 10 to 43 pins
• Image processing
   – Processes 2048 pixels per line
   – Processing speed: 540 ns per pixel (maximum)
   – Built-in 8-bit A/D converter (Includes a sensor signal delay function.)
   – Sensor drive circuit (Supports CCDs and all major CIS devices.)
   – Distortion correction (White distortion: 8-pixel averaging correction, black correction: Allows the black correction subtraction data to be set.)
   – γ-correction (Supports user-defined correction curves.)
   – Simple binary conversion processing (fixed threshold and density-adaptive threshold)
   – Halftone processing error diffusion method (64 levels)
   – Image reduction (decimation, fine black line retention, and fine white line retention)
• Modem
   – Group 3 FAX modem
      ITU-T V.29 (9600, 7200, and 4800 bps)
      ITU-T V.27ter (4800 and 2400 bps)
      ITU-T V.21ch2 (300 bps)
   – Simultaneous high/low-speed wait function
   – Short training function (ITU-T V.27ter only)
   – HDLC function (for all transmission speeds)
   – Synthesizer function
   – Caller ID function
      Bell 202 (1200 bps)
      ITU-T V.23 (1200 bps)
   – ADPCM function
      Encoding: 2, 3, or 4 bits
      Sampling frequencies: 9.6, 7.2, 4.8, and 3.6 kHz
   – RTC low-voltage backup
   – 5-V single-voltage power supply