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.
To Next Page
Loading...
