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參數(shù)資料
| 型號： | MSM6542-01 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT |
| 中文描述： | 實時時鐘周期和報警輸出 |
| 文件頁數(shù)： | 45/54頁 |
| 文件大小： | 378K |
| 代理商： | MSM6542-01 |
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Semiconductor
MSM6542-01/02/03
112
Method 2 (periodic readout)
C
D'
(0, d
2
, d
1
, d
0
)
* 2
IT/PLS
1
1
MASK
1
0
Read C
E
register
* 3
* 4
Idling
The CPU detects
an interrupt
Read C
E
register
IRQ FLAG
1
= 1
Y
When DP is 1
When DP is 0
Idling for at least 3 μs
Inhibit CPU from
accepting interrupts
Read clock registers
Read clock registers
Idling for at least 3 μs
* 5
* 5
Idling
* 6
Allow CPU to
accept interrupts
Other causes
* 7
* 8
N
* 1
Interrupt handling
routine
*5
Time required to increment the ripple
counter
*6, *7 The length of the time must be 122
μ
s
or more because interrupt output is
delayed 122
μ
s due to DP = 1. The
idling market *6 is provided for this
adjustment.
*8
To assure that readout is completed
before the next carry is generated, the
time required for these steps must
not be longer than the minimum set
time unit.
*1
Only for initial setting at power on
*2
The values of d2, d1, and d0 depend
on the required minimum time unit as
follows:
d2 d1 d0
When up to 1 s is required
1
0
1
When up to 1 min is required
1
1
0
When up to 10 min are required
1
1
1
*3
Dummy read to clear the IRQ FLAG
1
bit
*4
122
μ
s when the DP bit is 1,0
μ
s when
the DP bit is 0
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