Functional Block Diagram
ROM / FLASH Memory
Low-Power Operation
n
3.0 to 3.6 volt operating range
CMX850 Communications Controller
n
Full operation at 3.3V
n
Powersave at 3.3V
=
=
6.6mA typ.
6.0µA typ.
Modem
Tip/Ring from
Telco
To Telephone
Bell 103
DTMF
Pulse Tone
V.22bis
V.22
V.23
V.21
Bell 212A
Bell 202
Ring/Line Reverse Detect
Dual Tone Detect
Hook Detect
Relay Drive
CAS
Type II
FSK
Demod
ADC
Watchdog
Real-Time
Timer
Clock
n
Separate analogue and digital supply sections
LCD Controller and Display
Local Bootstrap
ROM
Memory Interface:
16-bit address
8-bit data
24 bit I/O
or
8 x 16 keyboard
matrix scanner
PWM x 2 or
2-bit I/O
Advance Power Management
n
The power efficiency of the CMX850 is infinitely variable in-line with
dynamic operational demands
n
Low power RC oscillator and powerdown speed-control for 80C51
clock
n
Standard 80C51 idle and powerdown modes; with automatic exit
without reset
n
External interrupts (ie. keyboard input) can bring the CMX850 µC up
from powerdown without system reset
n
Real-time clock and alarm interrupts available for µC ‘wake-up’
n
ADC monitoring can wake the µC on an input signal or level
Line
80C51 µC
Phone
Interfaces
256x8 Local
RAM
8kx8 XRAM
Peripheral Powersave
n
The following µC peripheral functions can be powersaved:
Oscillator and
Power Control
Modem - CAS Detector - A-to-D Converter - Pulse Width Modulator -
Real Time Clock - Watch-Dog Timer - Keyboard Encoder
n
Modem powersave
- disables all modem-section circuitry except ‘C-BUS’
and ‘Ring’ and ‘Hook’ detectors
Keyboard
Relay
Control
n
Controlling firmware is held in external FLASH memory accessed via the Memory Interface
n
Dynamic in-circuit programming and software upgrading in the field via Boot-ROM facility
n
Communication between the embedded V.22bis modem and the µC is over an internal serial bus
via the ‘C-BUS’ Controller
‘C-BUS’ Emulation for Modem Comms
n
Communication between internal modem and µC uses standard CML ‘C-BUS’ protocol
n
‘C-BUS’ controller registers are mapped via Special Function Registers (SFRs) in core
Dual Clocks and On-Chip RC Oscillator
n
Selectable 11.0592 or 12.288 MHz Xtal system clock
n
5.5MHz on-chip RC oscillator option for non-time critical operations
n
Ultra-low power 32.768kHz Xtal clock for real-time clock operation in powersave
100-pin low profile, small footprint quad flat package
3
CMLMICRO [ CML MICROCIRCUITS ]
