Echelon Neuron C - Manual (Page 40)

28 Focusing on a Single Device
objects can also be linked to Neuron C events, because changes in I/O often affect
task scheduling.
The Neuron C declaration syntax for I/O objects is described in detail in the I/O
Model Reference for Smart Transceivers and Neuron Chips .
I/O Object Types
Many I/O models are available for Neuron Chips and Smart Transceivers.
Certain I/O models are available only for specific chip types, but most are
available to all Neuron Chips and Smart Transceivers. A Neuron C application
instantiates an I/O model as an I/O object.
The I/O models are grouped into the following categories:
• Direct I/O Models are based on a logic level at the I/O pins; none of the
Neuron Chip or Smart Transceiver hardware's timer/counters are used in
conjunction with these I/O models. These models can be used in multiple,
overlapping combinations within the same Neuron Chip or Smart
Transceiver. Direct I/O models include the following types:
Input Model Types Output Model Types
bit bit
byte byte
leveldetect nibble
nibble touch
touch
• Timer/Counter I/O Models use a timer/counter circuit in the Neuron Chip
or Smart Transceiver. Each Neuron Chip and each Smart Transceiver
has two timer/counter circuits: One whose input can be multiplexed, and
one with a dedicated input. Timer/counter I/O models include the
following types:
Input Model Types Output Model Types
dualslope edgedivide
edgelog frequency
infrared infrared_pattern
ontime oneshot
period pulsecount
pulsecount pulsewidth
quadrature stretchedtriac
totalcount triac
triggeredcount
• Serial I/O Models are used for transferring data serially over a pin or a
set of pins. The neurowire, i2c, magcard, magcard_bitstream, magtrack1,
and serial I/O models are mutually exclusive within a single Neuron Chip
or Smart Transceiver. Both the input and output versions of a serial I/O
model can coexist within a single Neuron Chip or Smart Transceiver.
Serial I/O models include the following types:
Serial Input Model Types Serial Output Model Types
bitshift bitshift
magcard serial
magcard_bitstream