Вот в LPC2378 есть в RTC регистр:

CISS Counter Increment select mask for R/W * 0xE002 4040 Sub-Second interrupt


The CISS register provides a way to obtain millisecond-range periodic CPU interrupts
from the Real Time Clock. This can allow freeing up one of the general purpose timers, or
support power saving by putting the CPU into a reduced power mode between periodic
interrupts.
Carry out signals from different stages of the Clock Tick Counter are used to generate the
sub-second interrupts. The possibilities range from 16 counts of the CTC (about
488microseconds), up to 2,048 counts of the CTC (about 62.5milliseconds). The
available counts and corresponding times are given in

1.) Сдается мне, что в доке в два раза наврано - не от 16 до 2048, а от 32 до 4096
2) А почему нет аналогов CISS не только у более старших чипов, но и у более младших ?

Сообщение отредактировал evgen2 - Apr 6 2010, 17:53