Echelon Neuron C - Manual (Page 123)

Neuron C Reference Guide 103
{
io_set_baud(iosci,
SCI_38400);
// Optional baud change
}
io_set_clock( ) Built-in Function
The io_set_clock( ) built-in function allows an application to specify an alternate
clock value for any input or output timer/counter object that permits a clock
argument in its declaration syntax. The objects are listed below:
dualslope
edgelog
frequency
infrared
oneshot
ontime
period
pulsecount
pulsewidth
stretchedtriac
triac
For multiplexed inputs, use the io_select( ) function to specify an alternate clock.
When io_set_clock( ) is used, the I/O object automatically discards the first value
obtained.
You can call this function at any time. However, if your application specifies an
alternate clock value, it must call this function within the reset task and after
each call to the io_select() function.
Syntax
void io_set_clock ( io-object-name , clock-value );
io-object-name The I/O object name that corresponds to io-object-name in
the I/O declaration. This built-in function is used only for
timer/counter I/O objects.
clock-value Required clock selector value in the range of 0 to 7 (for
Series 3100 devices) or 0 to 15 (for Series 5000 devices), or
a variable name for the clock. This value overrides a
clock value specified in the object’s declaration.
You can use a TCCLK_* macro value from <echelon.h> to
specify the clock selector value. For Series 3100 devices,
you can use the macros whose values are in the range
0..7; for Series 5000 devices, you can use any of the
macros (values 0..15) for increased clock resolution.
However, for Series 5000 devices, you cannot specify a
value that defines a clock rate that is higher than one-half
of the device’s system clock. For example, if your system
clock rate is 20 MHz, you can specify any TCCLK_* macro
that defines a 10 MHz or lower clock rate (that is, you