參數(shù)資料
型號(hào)： MSM6542-03RS
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類(lèi)： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDIP24
封裝： 0.600 INCH, PLASTIC, DIP-24
文件頁(yè)數(shù)： 39/54頁(yè)
文件大?。?/td> 406K
代理商： MSM6542-03RS
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
1 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 CE register.
IRQ FLAG
2
:
When 1 is read from this bit with IT/PLS
2 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 CE register.
READ FLAG
:
When 1 is read from this bit, the bit is cleared after read.
TEST
1, TEST2
:
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 CF register
Read clock registers
* 2
* 1
* 3
Y
There is no carry while the clock registers
are being read.
Idling for 3 s
Read CF 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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