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M41T81M6F 参数 Datasheet PDF下载

M41T81M6F图片预览
型号: M41T81M6F
PDF下载: 下载PDF文件 查看货源
内容描述: 报警串行访问实时时钟 [Serial access Real-Time Clock with alarm]
分类和应用: 时钟
文件页数/大小: 30 页 / 303 K
品牌: STMICROELECTRONICS [ ST ]
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M41T81  
Clock operation  
3.6  
Square wave output  
The M41T81 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 4. Once the selection of the SQW frequency has been  
completed, the IRQ/FT/OUT/SQW pin can be turned on and off under software control with  
the Square Wave Enable Bit (SQWE) located in Register 0Ah.  
Table 4.  
Square wave output frequency  
Square wave bits  
Square wave  
RS3  
RS2  
RS1  
RS0  
Frequency  
Units  
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
None  
32.768  
8.192  
4.096  
2.048  
1.024  
512  
256  
128  
64  
-
kHz  
kHz  
kHz  
kHz  
kHz  
Hz  
Hz  
Hz  
Hz  
32  
Hz  
16  
Hz  
8
Hz  
4
Hz  
2
Hz  
1
Hz  
3.7  
Century bit  
Bits D7 and D6 of Clock Register 03h contain the CENTURY ENABLE Bit (CEB) and the  
CENTURY Bit (CB). Setting CEB to a '1' will cause CB to toggle, either from a '0' to '1' or  
from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0,'  
CB will not toggle.  
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