參數(shù)資料
型號: M41T82RMY6F
廠商: STMICROELECTRONICS
元件分類: 時鐘/數(shù)據(jù)恢復及定時提取
英文描述: 1 TIMER(S), REAL TIME CLOCK, PDSO18
封裝: 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-18
文件頁數(shù): 35/58頁
文件大?。?/td> 462K
代理商: M41T82RMY6F
Clock operation
M41T82 M41T83
3.9
Square wave output (M41T83 only)
The M41T83 offers the user a programmable square wave function which is output on the
SQW pin. RS3-RS0 bits located in 13h establish the square wave output frequency. These
frequencies are listed in Table 13. 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.
Note:
If the SQWE bit is set to '1' and VCC falls below the switchover (VSO) voltage, the square
wave output will be disabled.
Table 12.
Timer countdown value register bits (addr 11h)(1)
1.
Writing to the timer register will not reset the TF bit or clear the interrupt.
Bit
Symbol
Description
7 - 0
<timer countdown value>
This register holds the loaded countdown value ‘n’.
Countdown period = n / source clock frequency.
Table 13.
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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