BASIC stamp manual v2.2

5: BASIC Stamp Command Reference – POLLMODE
BASIC Stamp Syntax and Reference Manual 2.2 • www.parallax.com • Page 321
POLLIN 0, 0
POLLOUT 1, 1
POLLMODE 2
Main:
DEBUG "Looping...", CR
GOTO Main
In this example, the first two lines configure I/O pin 0 as a polled-input
(looking for a low state) and I/O pin 1 as a polled-output (going high if
I/O pin 0 goes low, and vice versa). The third line, POLLMODE, initiates
the polling process and configures polled-outputs to be active. From then
on, as the BASIC Stamp executes the rest of the program, it will check for a
low level (logic 0) on I/O pin 0, in-between instructions and will set I/O
pin 1 accordingly.
If, in the above example, the poll mode was set to 1 (which means
deactivate polling but save configuration) I/O pins 0 and 1 would still be
defined the same way, and I/O pin 1 would still be set to output mode,
but no polling would take place during the rest of the program.
Here's another example that demonstrates mode 1 (deactivate but save
configuration).
POLLIN 0, 0
POLLOUT 1, 1
POLLMODE 2
DEBUG "Polling configured.", CR
Main:
POLLMODE 1
DEBUG "No polling allowed here...", CR
PAUSE 1000
POLLMODE 2
Poll_Now:
DEBUG "Polling now...", CR
GOTO Poll_Now
In this case, polling is configured and activated before "Polling configured"
is printed on the screen. Once we reach the Main routine, however,
polling is disabled (via the POLLMODE 1 command) and no polling
occurs during the printing of "No polling allowed here…" or during the 1
second pause afterward. Finally, polling is activated again, and since the
configuration was saved (because of mode 1, before) the polling activity