General Structure Of Board Memory - Electrolux TC2 Service Manual

7.1.2

General structure of board memory

The system features an EEPROM, positioned externally to the microprocessor, which memorizes the
configuration data, the description of the cycle, the status of the appliance in case of a power failure, and the
alarms.
External
asynchronous
ROM
serial port
ROM
This area of the memory contains the "firmware" code including the functionalities of the appliance:
Control of electrical loads (motor, pump, heater)
Control of the sensors (NTC, conductimetric sensor, door switch status)
Control of the user interface
Control of the serial port
Control of power failures and alarms
Execution of the drying programme
In standard-production appliances, this area is a Read-Only Memory, and thus cannot be modified.
RAM
This memory contains the variables, i.e. all the dynamic information used during execution of the
programme:
Machine status
Cycle selected
Alarms
The contents of this memory are cancelled each time the appliance is disconnected (by switching off or in
the event of a power failure).
The contents can be read using a computer connected via a DAAS interface.
EEPROM
The EEPROM contains data of various types:
Power failure and machine status, i.e. the information necessary to resume operation of the appliance
after a power failure.
Configuration of the drying cycle: this file describes the various steps in the drying cycle for each
family of appliances (vented, condenser etc.).
Machine configuration: the data contained in this area of memory define the configuration of the
individual appliance, and are interpreted by the functional software. These files define the following:
Programmes
-
Number of buttons and their functions
-
Operation of the LEDs
-
Operation of the buzzer
-
- Operational limits (voltage/frequency)
- Identification of the appliance (PNC + ELC + serial number)
Heater unit power
-
Preferential direction of motor rotation
-
SOI/ADL
μP
Internal
synchronous
RAM
serial port
21/57
EEPROM
(external to
the μP)
Power Failure and
machine status
Configuration of
the appliance
Description
of the cycle
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