Chapter 5: Operating Principle
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The Spirometry Source
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5.3 MICROPROCESSOR
PHYSICAL DESCRIPTION
The microprocessor section is made up of a series of
electronic devices that save, manage, receive and send
data. In general terms, it is divided into:
- Basic hardware control program (BIOS) residing in the
internal Flash memory of the Micro controller (128 KBytes).
- Spirometry and equipment management program and
test database residing in the 2 MByte FLASH memory.
- Non-volatile 512 KByte RAM to save the equipment
configuration, status variables and calibration database.
- Central Processing Unit (CPU).
- Communications controller (RS232, USB and Bluetooth)
with external sources.
- Clock - Calendar - Alarm.
PROGRAM
The control program has been developed in assembly
code and top level C language to ensure very fast time
control and a structured program. It is divided into two
parts: the BIOS in internal Flash memory and the
application in external Flash memory.
MEMORY
The storage capacity for temporary data, for the
customized equipment configuration and for the calibration
database is 512 KB in non-volatile RAM. The test database
has a maximum capacity of 1 MByte.