Two more interrupt/timer/pwm questions, if you don't mind.

1. Is it possible to configure timer to enable-disable hpwm generator at predefined time amounts? say, 1 second on, 1 second off. So all this code will run in background, without taking CPU time?
2. Is it possible to change interrupt type on the fly? Say, interrupt was set to rising edge, it happened, and now changed to falling edge ?