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參數(shù)資料
| 型號(hào)： | M41T80M6F |
| 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： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SO1C-8 |
| 文件頁數(shù)： | 8/25頁 |
| 文件大小： | 343K |
| 代理商： | M41T80M6F |
Clock operation
M41T80
Doc ID 9074 Rev 4
3.3
Full-time 32 KHz square wave output
The M41T80 offers the user a special 32 KHz square wave function which defaults to output
on the F32K pin (pin 3) as long as VCC is valid, and the oscillator is running (ST bit = '0'). This
function is available within four seconds of initial power-up and can only be disabled by
setting the 32KE bit to '0' or the ST bit to '1.' If not used, the F32K pin should be disconnected
and allowed to float.
Note:
The F32K pin is an open drain which requires an external pull-up resistor.
3.4
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.
Table 5.
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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