MC68HC908LJ12 Datasheet, PDF (215/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Real Time Clock (RTC)
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.
Address: $0042
Read:
ALMIE
Write:
CHRIE
DAYIE
HRIE
MINIE SECIE TB1IE
Reset: 0
0
0
0
0
0
0
Figure 12-3. RTC Control Register 1 (RTCCR1)
TB2IE
0
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
Technical Data
216
Real Time Clock (RTC)
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor