Freescale Semiconductor MPC5200B ユーザーズマニュアル
MPC5200B Users Guide, Rev. 1
7-72
Freescale Semiconductor
Real-Time Clock
7.6.3.8
RTC Periodic Interrupt and Bus Error Register—MBAR + 0x081C
This is a read-only register.
Bits
Name
Description
0:6
—
Reserved
7
Int_alm
Status bit indicating that enabled once-a-day Alarm has occurred (active high). Alarm
interrupt has been activated. This bit and the Interrupt is cleared by writing 1 to this bit
position.
interrupt has been activated. This bit and the Interrupt is cleared by writing 1 to this bit
position.
Note: A Stopwatch interrupt, if also active, must be cleared before the interrupt signal to the
CPU is negated.
CPU is negated.
8:14
—
Reserved
15
Int_SW
Status bit indicating that Stopwatch expiration has occurred (active high). Stopwatch
interrupt has been activated. This bit and the Interrupt are cleared by writing 1 to this bit
position.
interrupt has been activated. This bit and the Interrupt are cleared by writing 1 to this bit
position.
Note: An Alarm interrupt, if also active, must be cleared before the interrupt signal to the
CPU is negated.
CPU is negated.
16:22
—
Reserved
23
Alm_status
Status bit indicating that once-a-day Alarm has occurred. Same as Int_alm bit above except
that clearing this bit does NOT clear the interrupt.
that clearing this bit does NOT clear the interrupt.
24:31
SW_min
Minutes remaining in stopwatch.
Table 7-63. RTC Periodic Interrupt and Bus Error Register
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
Reserved
Bus_error_1
Reserved
Int_da
y
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
In
t_min
Reserved
Int_sec
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bits
Name
Description
0:6
—
Reserved
7
Bus_error_1
Internal status register—If high, indicates software has attempted a write access to a
read-only register in this module. No actual register contents are corrupted if this happens.
read-only register in this module. No actual register contents are corrupted if this happens.
Cleared by writing 1 to this bit position.
8:14
—
Reserved
15
Int_day
Periodic interrupt at midnight. High indicates interrupt has occurred.
OR’d function of Int_day, Int_min and Int_sec produces RTC periodic interrupt to CPU
interface.
interface.
Cleared by writing 1 to this bit position.