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Section 3
The TIDAL WAVE is a microprocessor-based handheld instrument that measures the clinical parameters
of CO
patient information gathered from the CAPNOSTAT® sensor. The theory of operation of the TIDAL
WAVE is explained in detail in the subsections that follow.
3.1 2738 Main Board
For circuit diagrams of the digital section described below, refer to sheet 1 of the Main Board (2738-03)
schematics. Embedded control for the system is provided by IC1, a Motorola MC68332 integrated
microcontroller. In addition to a full 32-bit Central Processing Unit (CPU), this device also contains
circuitry for system clock generation, peripheral chip select generation, data control, interrupt generation,
a sophisticated timing co-processor, synchronous and asynchronous serial communication. In general,
functional signals are grouped together into ports, and each signal can be independently programmed by
software to be its pre-defined port function or as discrete I/O. Additionally, the functionality for several
ports (Port C, E and F) can be pre-defined by the state of the data bus on system power-up. A special
"background mode" port allows the device to be controlled by an external source for system debugging
and testing. Also integrated on-chip are several activity monitors, as well as a software watchdog to
ensure proper device and system operation. Refer to Table 1.
TPU
16 Channels
QSM
4 Synchronous Serial
Chip Selects & one
asynchronous
serial channel
Background Mode
C
E
F
Rev. 01
production and respiration rate. The system contains all the circuitry necessary for displaying
2
Port
Timing Signal Generation
Serial Communications Port:
QSPI: Queued Serial Peripheral
Interface
SCI: Serial Communications
Interface
System debugging
Chip Selects
Bus Control
MODCK and Interrupts
Table 1. CPU Port Functions
Defined Function
Theory of Operation
Functionality Control,
Data Bus Control
(Alt Functions: D pulled low)
Each channel independently user
programmable as TPU function or as
Discrete I/O
QSPI chip selects independently user pro-
grammable, can be used as
Discrete I/O or decoded to create up to 16
chip selects. SCI transmit can be pro-
grammed as Discrete I/O
Allows an appropriate external device to
control the microprocessor and system
D0: CSBOOT* Data Width, 8 or 16-bit
D1: CS0*-CS3* or BR*,BG*,BGACK*
D2: CS3*-CS5* or FC0-FC2
D3-D7: CS6*-CS10* or A19-A23
D8: Control Signals or Discrete I/O
D9: MODCK & IRQ or Discrete I/O
Model 610 Service Manual
7
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