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| 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)： | 44/54頁 |
| 文件大?。?/td> | 378K |
| 代理商： | MSM6542-01 |
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Semiconductor
MSM6542-010/2/03
111
[Reading individual registers]
(a) Ordingary registers
Any registers can be read freely. However, the contents of the following bits change after
they are read.
C
E
register
IRQ FLAG
1
:
When 1 is read from this bit with IT/PLS
set at 1, the bit is cleared
after read. For the timing when the bit is cleared, see the description
of the IRQ FLAG
1
bit of the C
E
register.
IRQ FLAG
2
:
When 1 is read from this bit with IT/PLS
set at 1, the bit is cleared
after read. For the timing when the bit is cleared, see the description
of the IRQ FLAG
2
bit of the C
E
register.
READ FLAG
:
When 1 is read from this bit, the bit is cleared after read.
TEST
1
, TEST
2
:
These bits are reset immediately when they are read. Therefore, 0
is always read from these bits.
(b) Reding time
Method 1 (unscheduled reading)
N
RF = 0
Read C
F
register
Read clock registers
* 2
* 1
* 3
Y
There is no carry while the clock registers
are being read.
Idling for 3 μs
Read C
F
register
*1
Dummy read to clear the READ FLAG (RF) bit
*2
Time required to increment the ripple counter
*3
Loop to retry read because of a carry generated in the
one-second digit counter during clock register reading
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