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Maxim Integrated DS3231 RTC
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Details:
 - DS3231 datasheet: https://datasheets.maximintegrated.com/en/ds/DS3231.pdf


Logic analyzer setup
--------------------

The logic analyzer used was Geeetech Mini Board Cypress FX2(LP) eval board
with fx2lafw firmware (at 4MHz):

 Probe          DS3231 pin
 -------------------------
 0              SCL
 1              SDA


ds3231_ex1.sr
----------------------

The file provides reading/writing of time keeping registers as well as
control, control/status and temperature registers of the RTC chip, which
was setup to 24-hours mode:

- Read Control register
- Write Control register - disable alarms
- Read Control/Status register
- Write Control/Status register - clear alarm's flags
- Write Alarm 1 registers - set Alarm 1 at every 1st date
- Write Alarm 2 registers - set Alarm 2 at every minute
- Read date/time
- Read temperature (MSB)


ds3231_ex2.sr
----------------------

The file provides reading/writing of time keeping registers as well as
control/status and temperature registers of the RTC chip, which was setup
to 24-hours mode and after Alarm 2 occured:

- Read Control/Status register
- Write Control/Status register - clear alarm flag
- Read date/time
- Read temperature (MSB)