Control Register 13
| INTSSIE | Every 0.5-second interrupt enable bit |
| INTSIE | Every second interrupt enable bit |
| INTMIE | Every minute interrupt enable bit |
| INTHIE | Every hour interrupt enable bit |
| INTTMIE | Timer underflow interrupt enable bit |
| INTALIE | Alarm coincidence interrupt enable bit |
| INTERIE | Time rewrite error interrupt enable bit |
| INTCRIE | Year/month/date/hour/minute/second/day of the week counter value read completion interrupt enable bit |