•Timer Mode 2 (Auto-Reload):
–Timer low -byte (TLx) operates as
an 8-bit timer while the timer high -byte (THx) holds a reload value.
–When the count overflows from FFH-to-00H, not only the timer flag set, but also the
value in THx is loaded into TLx, and counting continues from this value up
to next
FFH-to-00H, so on.