Board Users Guide

Real-Time Clock
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 7-69
7.6.3.3 RTC New Year and Stopwatch Register—MBAR + 0x0808
7.6.3.4 RTC Alarm and Interrupt Enable Register—MBAR + 0x080C
Table 7-58. RTC New Year and Stopwatch Register
msb 012345678 9 101112131415
R
Reserved
write_SW
SW_set
W
RESET:0 00000000 0 0 0 00 0 0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 lsb
R
Reserved Year_set
W
RESET:0 00000000 0 0 0 00 0 0
Bits Name Description
0:6 —
Reserved
7 write_SW Typical stopwatch operation is to write initial value into 8-bit wide SW_set and assert
write_SW bit. The write_SW bit is immediately auto cleared, but it triggers the stopwatch
minute countdown to begin.
8:15 SW_set Number of minutes to be written into stopwatch. Max is 255, a little over 4 hours.
16:19 — Reserved
20:31 Year_set New year written in RTC after successful state machine transition by set_date and
pause_date bits.
Note: This is part of date set function in the previous register.
Table 7-59. RTC Alarm and Interrupt Enable Register
msb 012345678 9 101112131415
R
Reserved
Alm_enable
Reserved Alm_24H_set
W
RESET:0 00000000 0 0 0 00 0 0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 lsb
R
Reserved Alm_Min_set Reserved
MPEb
IntEn_day
IntEn_min
IntEn_sec
W
RESET:0 00000000 0 0 0 10 0 0
Bits Name Description
0:6 — Reserved
7 Alm_enable Alarm Enable bit for once-a-day Alarm. If high, Alarm status/interrupt operation is enabled.
If low, Alarm setting is not compared to time of day.