SAM3S8C Atmel Corporation, SAM3S8C Datasheet - Page 255

• Manufacturer Part Number: SAM3S8C
• Manufacturer: Atmel Corporation

The value obtained must be rounded to the nearest integer prior to being programmed into CORRECTION field.
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 Output Source Selection
• OUT1: RTCOUT1 Output Source Selection
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
If HIGHPPM = 1, then the clock frequency correction range is from 30.5 ppm up to 1950 ppm. The RTC accuracy will
be 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:
Value
Value
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
CORRECTION
CORRECTION
Name
NO_WAVE
FREQ1HZ
FREQ32HZ
FREQ64HZ
FREQ512HZ
ALARM_TOGGLE
ALARM_FLAG
PROG_PULSE
Name
NO_WAVE
FREQ1HZ
FREQ32HZ
FREQ64HZ
FREQ512HZ
ALARM_TOGGLE
ALARM_FLAG
PROG_PULSE
=
=
------------------------ - 1
20
3906
------------ - 1
ppm
3906
×
Description
no waveform, stuck at ‘0’
1 Hz square wave
32 Hz square wave
64 Hz square wave
512 Hz square wave
output toggles when alarm flag rises
output is a copy of the alarm flag
duty cycle programmable pulse
Description
no waveform, stuck at ‘0’
1 Hz square wave
32 Hz square wave
64 Hz square wave
512 Hz square wave
output toggles when alarm flag rises
output is a copy of the alarm flag
duty cycle programmable pulse
ppm
–
–
SAM3S8/SD8
SAM3S8/SD8
255
255