Echelon Neuron C - Manual (Page 179)

Neuron C Programmer’s Guide 167
COMM_IGNORE Causes incoming messages to be ignored.
PULLUPS_ON Enables all internal pullup resistors for Series
3100 devices (the default action is to disable
the pullups, which lowers power
consumption).
TIMERS_OFF Turns off all timer objects (declared with
mtimer and stimer) in the program.
io-object-name An input object declared for any one of pins IO_4 through
IO_7. When any I/O transition occurs on the specified pin, the device
wakes up. If this parameter is omitted, I/O is ignored while the
device is in sleep mode. This I/O object can be defined for wakeup
purposes only, or could be used for other I/O purposes as well.
io-pin Specifies one of pins IO_4 through IO_7. When any I/O transition
occurs on the specified pin, the Neuron Chip or Smart Transceiver
wakes up. If this parameter is omitted, I/O is ignored while the
device is in sleep mode.
For example, to sleep and turn off timers and enable pullups, the call to sleep( ) is
as follows:
sleep(TIMERS_OFF | PULLUPS_ON);
Example:
IO_4 input bit wakeup_pin1;
when timer_expires(timer_2)
{
sleep(COMM_IGNORE, wakeup_pin1);
//or, sleep(COMM_IGNORE, IO_4);
}
You can force sleep mode even though the flush has not completed, as described
in Forced Sleep on page 168.
When an event occurs that wakes the Neuron Chip or Smart Transceiver, the
program resumes at the first statement after the sleep function call. If the
sleep( ) call is the last statement in a task, the program returns to the scheduler
after it wakes up.
A device wakes up whenever a packet is received by the transceiver (unless you
specified COMM_IGNORE). The device wakes up even if the packet is not
addressed to the device. You are responsible for putting the device back to sleep
if this occurs.
If a device sleeps for less than the receive timer duration and uses the
comm_ignore option, it could receive duplicate messages or network variable
update events. The default receive timer is set by a network tool during device
installation. The receive timer has a hard-coded minimum value of 768 ms. This
value can be increased by a network tool, depending on the network connections
to the device.