Multitone RPR 583, Техническое руководство

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LIQUID
EEPROM
CRYSTAL
DISPLAY
MODULE
SRAM
M
AUDIBLE
ALERT
VIBRATE
MOTOR
MICRO-
PROCESSOR
SK1 PL401
TAG11341-1
DATA BUS
ADDRESS BUS
CONTROL LINES
OSCILLATOR
PGM
DATA
XL2
SW2
SW3
SW1
!
>
BUTTON
BUTTON
BUTTON
FROM / TO
RECEIVER
RESET
IC5
VDD
IC1
IC3
TR7
RESET
DRIVER
DRIVER
TR415
TR3; TR4
TP401
DRIVER
TR2
TR416
DISPLAY
LAMP
SK1 PL401
IC4
RESET
PROG
FSTCHG
RXEN
LOWB
PROG
CHARGE
DETECT CHARGING
DETECTOR
BATTERY
TR5
TR6
32.768
KHz
RPR 583
TM1212 Issue 1 Page 3 - 7
Figure 3.3 Decoder Block Diagram
3.3 DECODER
3.3.1 General
The Decoder comprises the Decoder Oscillator, Microprocessor, EEPROM, SRAM
message memory and switches, plus support components and a separate LCD
module. The signal from the receiver is processed by the decoder software in the
microprocessor. The microprocessor stores the information in the SRAM, IC4,
before activating the selected alert and sending the message data to the LCD
module for display. The EEPROM holds information applicable to the unit.
3.3.2 Message Decoder
The Microprocessor, IC3, contains software to process data signals received in
Multitone Mk7 format. When no valid signals are received by the unit, the system
goes into a standby mode to reduce power consumption.