2/Theory of Operation
1503-0151-000
3/27/97
2-15
Microcontroller Assembly
The Microcontroller Assembly contains all of the major circuit functions necessary
to control ventilator operation. This assembly consists of the following individual
circuits:
Motorola 68340 Processor Core
The CPU core consists of the following internal functions:
•
Bus access control signals for all memory and peripheral devices
•
Interrupt handling
•
Clocks and timers for the system
•
Background debug mode
•
Two RS232C serial I/O ports
•
Baud rate generator for serial ports
•
Hard (power-up) and soft (watchdog error) reset generation
•
Data bus buffers
Memory and I/O decoding
Program Memory
Safety Relevant Computing
Watchdog System
Data Acquisition
Flow Valve Control
Inlet Valve Drive
Front Panel Interface
Audio Alarm
Regulator Output/Manifold Pressures
Functional Specifications
Motorola 68340 Processor Core
System Integration Module
System Clock
An external 32.768 KHz crystal is used with the internal clock synthesizer to gen-
erate a 24.11 MHz system clock.
Periodic Interrupt Timer
The periodic interrupt timer is the time base for the Real Time Operating System.
Summary of Contents for Aestiva 7900 SmartVent
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Page 12: ...Notes viii 1503 0151 000 3 27 97 ...
Page 18: ...1 Introduction 1 6 1503 0151 000 5 26 0 Notes ...
Page 44: ...2 Theory of Operation 2 26 1503 0151 000 3 27 97 Notes ...
Page 46: ...3 Post Service Checkout 3 2 1503 0151 000 5 26 0 Notes ...
