Datasheet

341
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-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 (used to correct crystal that are faster than the nominal 32.768 kHz).
 OUT0: RTCOUT0 OutputSource Selection
 OUT1: RTCOUT1 Output Source Selection
 THIGH: High Duration of the Output Pulse
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
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
Value Name Description
0 H_31MS 31.2 ms
1 H_16MS 15.6 ms
2 H_4MS 3.91 ms
3 H_976US 976 µs
4 H_488US 488 µs
CORRECTION
3906
20 ppm×
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1–=
CORRECTION
3906
ppm
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1–=