RTC: Difference between revisions

The RTC is capable of multiple frequencies. The base time update is pre-programmed at 32.768 kHz. It is possible to change this value, however, this is the only base frequency capable of keeping proper time. For this reason, it is strongly NOT recommended that you NOT change the frequency of the RTC, or your computers clock will no longer be accurate. The output(interrupt) divider frequency is by default set so that there is an interrupt rate of 1024 Hz.If you need an interrupt frequency higher than 1024 Hz, it is possible to reprogram just the rate of the interrupt. The RTC can handle 15 interrupt rates between 2 Hz and 32767 Hz, theoretically. On most machines however, the interrupt rate can not go higher than 8 kHz.