17.2.1.2 RTC Counter
The RTC counter keeps track of seconds, minutes, hours, days, weeks, and years when in Calendar mode, and for this purpose it requires a 43-bit counter. When counting in Binary mode, the 43-bit register is treated as a linear up counter.
The following table shows the details for Calendar mode and Binary mode.
| Function | Number of Bits | Range | Reset Value | ||
|---|---|---|---|---|---|
| Calendar Mode | Binary Mode | Calendar Mode | Binary Mode | ||
| Second | 6 | 0-59 | 0-63 | 0 | 0 |
| Minute | 6 | 0-59 | 0-63 | 0 | 0 |
| Hour | 5 | 0-23 | 0-31 | 0 | 0 |
| Day | 5 | 1-31 (auto adjust by month and year) | 0-31 | 1 | 0 |
| Month | 4 | 1-12 | 0-15 | 1 | 0 |
| Year | 8 | 0-255 Year 2000 to 2255 | 0-255 | 0 (year 2000) | 0 |
| Weekday | 3 | 1-7 | 0-7 | 1 | 0 |
| Week | 6 | 1-52 | 0-63 | 1 | 0 |