Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD データシート
製品コード
ATSAM4S-XPLD
269
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
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.
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 Output Source 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 Oms
3
H_976US
976
μs
4
H_488US
488
μs
CORRECTION
3906
ppm
-------------
1
–
=