參數(shù)資料
型號(hào)： M41T66Q6F
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, QCC16
封裝： 3 X 3 MM, ROHS COMPLIANT, QFN-16
文件頁(yè)數(shù)： 13/33頁(yè)
文件大?。?/td> 336K
代理商： M41T66Q6F
Clock operation
M41T66
3.5
Square wave output
The M41T66 offers the user a programmable square wave function which is output on the
SQW pin. RS3-RS0 bits located in 04h establish the square wave output frequency. These
frequencies are listed in Table 4. Once the selection of the SQW frequency has been
completed, the SQW pin can be turned on and off under software control with the square
wave enable bit (SQWE) located in register 0Ah.
The SQW output is an open drain output driver. The initial power-up default for the SQW
output is 32 KHz.
Note:
When the SQW is enabled and the ST bit is set (ST = 1), the square wave output could be
low or high and could drain current through the pull-up resistor.
Due to the output buffer circuitry used for the SQW output, this pin must not be taken to a
voltage greater than VCC. A diode is required on the SQW pin for SuperCap (or battery)
backup. A low threshold BAT42 diode is recommended (see Figure 4 on page 7).
3.6
Century bits
These two bits will increment in a binary fashion at the turn of the century, and handle all
leap years correctly. See Table 6 on page 22 for additional explanation.
Table 4.
Square wave output frequency
Square wave bits
Square wave
RS3
RS2
RS1
RS0
Frequency
Units
0000
None
–
0001
32.768
kHz
0010
8.192
kHz
0011
4.096
kHz
0100
2.048
kHz
0101
1.024
kHz
0110
512
Hz
0111
256
Hz
1000
128
Hz
1001
64
Hz
1010
32
Hz
1011
16
Hz
11008
Hz
11014
Hz
11102
Hz
11111
Hz
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