CMX850 Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX850

Communications Controller

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

CMX850

Communications

Controller

D/850/6 December 2003

Features

• 8051 µC 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

Provisional Issue

• 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

1.1 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.

© 2003 CML Microsystems Plc

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