CMX850-1 Просмотр технического описания (PDF) - CML Microsystems Plc
Номер в каталоге
Компоненты Описание
производитель
CMX850-1 Datasheet PDF : 8 Pages
| |||
Functional Block Diagram
ROM / FLASH Memory
CMX850 Communications Controller
Tip/Ring from
Telco
To Telephone
Modem
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
Local Bootstrap
ROM
Memory Interface:
16-bit address
8-bit data
80C51 µC
24 bit I/O
or
8 x 16 keyboard
matrix scanner
256x8 Local
RAM
8kx8 XRAM
PWM x 2 or
2-bit I/O
Oscillator and
Power Control
Relay
Keyboard
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
3
Low-Power Operation
n 3.0 to 3.6 volt operating range
n Full operation at 3.3V
= 6.6mA typ.
n Powersave at 3.3V
= 6.0µA typ.
n Separate analogue and digital supply sections
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
Peripheral Powersave
n The following µC peripheral functions can be powersaved:
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
100-pin low profile, small footprint quad flat package
Share Link: 