at regular intervals rather than back-to-back.
The divider is reset when either of these fields are written.
Total period is 1 + INT + FRAC / 256
FRAC
reader - Fractional part of clock divisor. First-order delta-sigma.FRAC
writer - Fractional part of clock divisor. First-order delta-sigma.INT
reader - Integer part of clock divisor.INT
writer - Integer part of clock divisor.DIV
readerDIV
writer