Freescale Semiconductor MPC5200B ユーザーズマニュアル
MPC5200B Users Guide, Rev. 1
7-70
Freescale Semiconductor
Real-Time Clock
7.6.3.5
RTC Current Time Register—MBAR + 0x0810
This is a read-only register.
8:10
—
Reserved
11:15
Alm_24Hset
Hour setting (in 24 hour format) to be compared to time of day for the purpose of generating
Alarm Status/Interrupt. Can be written at any time.
Alarm Status/Interrupt. Can be written at any time.
16:17
—
Reserved
18:23
Alm_Min_set
Minute setting to be compared to time of day for the purpose of generating Alarm
Status/Interrupt. Can be written at any time.
Status/Interrupt. Can be written at any time.
24:27
—
Reserved
28
MPEb
Master Periodic Enable bar. Must be written low after reset to allow periodic interrupts.
29
IntEn_day
Enable bit of periodic interrupts at midnight rollover.
30
IntEn_min
Enable bit of periodic interrupts at minute rollover.
31
IntEn_sec
Enable bit of periodic interrupts at second rollover.
Note: The Interrupt enable bits (28, 29, 30, 31) control the Periodic Interrupt coming from the RTC. The separate
Stopwatch/Alarm Interrupt signal does not have a specific interrupt enable bit. An Alarm interrupt is automatically
generated if Alarm is enabled and the Alarm setting matches time of day. Similarly, a Stopwatch expiration, which
shares the Alarm interrupt signal, automatically occurs once the Stopwatch is initiated and the Stopwatch counter
expires.
Stopwatch/Alarm Interrupt signal does not have a specific interrupt enable bit. An Alarm interrupt is automatically
generated if Alarm is enabled and the Alarm setting matches time of day. Similarly, a Stopwatch expiration, which
shares the Alarm interrupt signal, automatically occurs once the Stopwatch is initiated and the Stopwatch counter
expires.
Table 7-60. RTC Current Time Register
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
Reserved
Hour
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
Reserved
Second
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits
Name
Description
0:10
—
Reserved
11:15
Hour
Hour format can be either 24-hour or 12-hour with AM/PM.
If 24-hour format is selected (SlctHour low in Reg 0), the whole 5-bit hour field designates
current time in 24-hour format.
current time in 24-hour format.
If 12-hour format is selected (SlctHour high in Reg 0), the MSB of hour field indicates:
• Hour[0]=0: AM,
• Hour[0]=1: PM and
• Hour[1:4] designates current time in 12-hour format.
• Hour[0]=1: PM and
• Hour[1:4] designates current time in 12-hour format.
16:17
—
Reserved
18:23
Minute
Shows minutes in current time.
Bits
Name
Description