•- TF1, TF0 : Overflow flags for Timer 1 and Timer 0.
-- TR1,
TR0 : Run control
bits for Timer 1 and Timer 0.
Set to run,
reset to hold.
•
•- IE1,
IE0 : Edge flag for
external interrupts 1 and 0. *
• Set by interrupt edge, cleared when interrupt is
processed.
•- IT1,
IT0 : Type bit for
external interrupts. *
• Set for falling edge interrupts, reset for 0 level
interrupts.
•
•* = not related to counter/timer operation but used to detect and initiate external interrupts.