1 rtc time set register-mbar + 0x0800, Rtc time set register, 0x08 – Freescale Semiconductor MPC5200B User Manual
Page 226
Real-Time Clock
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor
7-67
7.6.3.1
RTC Time Set Register—MBAR + 0x0800
•
RTC New Year and Stopwatch Register
(0x0808)
•
RTC Periodic Interrupt and Bus Error Register (0x081C)
,
read-only
•
RTC Alarm and Interrupt Enable Register
(0x080C)
•
RTC Test Register/Divides Register (0x0820)
•
RTC Current Time Register (0x0810)
, read-only
Table 7-56. RTC Time Set Register
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
Reserved
set_tim
e
pa
use_t
ime
Reserved
SlctH
our
C24Hour_set
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 lsb
R
Reserved
Minute_set
Reserved
Second_set
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits
Name
Description
0:5
—
Reserved
6
set_time
A bit used in conjunction with pause_time bit (below) to cause a new time to be programmed
into the RTC. After a proper software sequence, the values in the *_set fields below are
loaded.
The proper software sequence is:
1.
Write register with pause_time 1 and set_time 0
2.
Write register with pause_time 1 and set_time 1
3.
Write register with pause_time 1 and set_time 0
4.
Write register with pause_time 0 and set_time 0
At completion of Step 4, RTC is updated with the new time.
The C24Hour_set, Minute_set, and the Second_set fields should remain consistent values
throughout the four steps (i.e., at the desired new time values).
Note: Read-modify-write operations may disrupt this procedure, it is advised that four
simple writes occur. Byte writes to this byte are also acceptable.
7
pause_time
Used with set_time above to perform time update. Must be zero for normal operation.
8:9
—
Reserved
10
SlctHour
This bit determines the hour output format.
• low bit = 24-hour format
• high bit = 12-hour format with AM/PM
Note: This bit does NOT affect time set procedure, it only affects how the Hour Status field
is presented.
11:15
C24Hour_set
Hour in 24-hour format written in RTC after successful state machine transition by set_time
and pause_time bits.
Note: This field is always written with 24-Hour format, it is NOT affected by SlctHour bit
above.
16:17
—
Reserved