Brief Description
This IC combines an extended function CMX860 with a full-function 8051 microcontroller (including UART and timer/counters), and has 8kbytes of RAM to form a powerful communications processor. Extended addressing offers page mode access to 4Mbytes of external FLASH memory. A 32.768kHz clock system allows a very low power interrupt-driven real time clock, watchdog timer and keyboard encoder. The device also includes a separate CAS tone detector and FSK receiver, two low power PWM outputs and a multiplexed 2-input 10-bit A to D converter with auto-convert and threshold detect. Advanced low power and sleep modes, including the ability to work from an on-chip RC oscillator, aid low battery consumption.

FEATUREs
• 8051 mC with internal 8K XRAM and up to 35 GPIO
• 64K address, bank switchable to many Mbytes
• Interfaces for external RAM, LCD controller, etc.
• V.22bis, V.22, V.23, V.21 (and Bell) integral modem
• DTMF/Tones transmit and receive
• Line and Phone differential amplifiers
• Dual clocks with separate Xtals
• CLI/CIDCW Tones detection and generation
• Line reversal / Ring detection
• Off-hook detector
• Low power operation
• Advanced power management features
• Watchdog timer
• Real-time clock and alarm function
• Bootstrap ROM to reprogram external FLASH
• Customised memory versions available from CML
• Standard 8051 UART and timers
• 2 input 10-bit A to D converter
• Keyboard encoder (16 x 8 matrix max)
• 2 x low-power PWM outputs
• Programmable Tx DTMF twist
• Dedicated low-power FSK Rx for CLI
• Small footprint: 100-pin LQFP

APPLICATIONs
• SMS and ADSI terminals
• Telemetry and meter reading systems
• Security systems
• Feature phones
• Routers
• EPOS terminals
• E-Mail and Internet appliances