Datasheet

296

SAM4S Series [DATASHEET]

11100F–ATARM–29-Jan-14

The value obtained must be rounded to the nearest integer prior to being programmed into CORRECTION field.

If HIGHPPM = 1, then the clock frequency correction range is from 30.5 ppm up to 1950 ppm. The RTC accuracy is

less than 1 ppm for a range correction from 30.5 ppm up to 90 ppm.

The correction field must be programmed according to the required correction in ppm; the formula is as follows:

The value obtained must be rounded to the nearest integer prior to be programmed into CORRECTION field.

If NEGPPM is set to 1, the ppm correction is negative.

• OUT0: RTCOUT0 OutputSource Selection

• OUT1: RTCOUT1 Output Source Selection

Value Name Description

0 NO_WAVE no waveform, stuck at ‘0’

1 FREQ1HZ 1 Hz square wave

2 FREQ32HZ 32 Hz square wave

3 FREQ64HZ 64 Hz square wave

4 FREQ512HZ 512 Hz square wave

5 ALARM_TOGGLE output toggles when alarm flag rises

6 ALARM_FLAG output is a copy of the alarm flag

7 PROG_PULSE duty cycle programmable pulse