Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Hoja De Datos
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ATSAM4S-WPIR-RD
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
304
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.
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.
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
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
CORRECTION
3906
ppm
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1
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