參數(shù)資料
型號(hào)： 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(shí)時(shí)時(shí)鐘周期和報(bào)警輸出
文件頁(yè)數(shù)： 34/54頁(yè)
文件大?。?/td> 378K
代理商： MSM6542-01
Semiconductor
MSM6542-01/02/03
101
Frequency
counter
Eye
Frequency adjustment
C
D
←
(0, 0, 1, 0)
Read C
E
register
*3
IRQ FLAG1
A carry (oscillation) is checked
Output of a signal at the frequency set by C
D'
is command through pin 1.
N
Y
*1 To cancel data protection, oscillation must be in progress. It takes about 13 ms (2 ms
during which the writing of DP
0 is inhibit in the rising of CS
plus 11 ms required until
DP = 0 is executed.) This loop includes a wait time before oscillation starts. Usually, the
loop takes 0.5 to 2 seconds. When the power is turned on, the value of the DP bit is
unpredictable. When the value is 0 incidentally, the loop does not return.
*2, 3
The IRQ FLAG
is cleared at the step marked *2. If IRQ FLAG
= 1 is detected in the loop
marked *3, therefore, it means that original oscillation is divided.
Other notes
Possible causes why the loop marked *1 or *3 becomes endless
Yes
→
Incorrect programming
The frequency counter is not adjusted.
Observe the waveform at pin 1 on an
oscilloscope.
Oscillation is impeded by a leak due to
a dirty PC board. Clean the PC board.
The capacitance of the capacitor for
oscillation is inadequate. Consult the
crystal manufacturer.
Defective crystal oscillator or IC. Re-
place it.
Oscillation waveform at
XT
No
→
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