Datasheet

Real Time Clock (RTC)
Technical Data MC68HC908LJ12 — Rev. 2.1
216 Real Time Clock (RTC) Freescale Semiconductor
12.6 RTC Registers
The RTC module has thirteen memory-mapped registers:
• RTC control register 1 (RTCCR1)
• RTC control register 2 (RTCCR2)
• RTC status register (RTCSR)
• Alarm minute and hour registers (ALMR and ALHR)
• Second register (SECR)
• Minute register (MINR)
• Hour register (HRR)
• Day register (DAY)
• Month register (MTHR)
• Year register (YRR)
• Day of the week register (DOWR)
• Chronograph data register (CHRR)
12.6.1 RTC Control Register 1 (RTCCR1)
The RTC control register 1 (RTCCR1) contains the eight interrupt enable
bits for RTC interrupt functions.
ALMIE — Alarm Interrupt Enable
This read/write bit enables the alarm flag, ALMF, to generate CPU
interrupt requests. Reset clears the ALMIE bit.
1 = ALMF enabled to generate CPU interrupt
0 = ALMF not enabled to generate CPU interrupt
Address: $0042
Read:
ALMIE CHRIE DAYIE HRIE MINIE SECIE TB1IE TB2IE
Write:
Reset:00000000
Figure 12-3. RTC Control Register 1 (RTCCR1)