参数资料
型号: M41T80M6E
厂商: STMICROELECTRONICS
元件分类: 时钟/数据恢复及定时提取
英文描述: 1 TIMER(S), REAL TIME CLOCK, PDSO8
封装: 0.150 INCH, LEAD FREE, PLASTIC, SO1C-8
文件页数: 23/25页
文件大小: 343K
代理商: M41T80M6E
M41T80
Operation
Doc ID 9074 Rev 4
2
Operation
The M41T80 clock operates as a slave device on the serial bus. Access is obtained by
implementing a start condition followed by the correct slave address (D0h). The 20 bytes
contained in the device can then be accessed sequentially in the following order:
1st byte: tenths/hundredths of a second register
2nd byte: seconds register
3rd byte: minutes register
4th byte: century/hours register
5th byte: day register
6th byte: date register
7th byte: month register
8th byte: year register
9th byte: control register
10th byte: 32KE bit
11th - 16th bytes: alarm registers
17th - 19th bytes: reserved
20th byte: square wave register
2.1
2-Wire bus characteristics
The bus is intended for communication between different IC’s. It consists of two lines: a bi-
directional data signal (SDA) and a clock signal (SCL). Both the SDA and SCL lines must be
connected to a positive supply voltage via a pull-up resistor.
The following protocol has been defined:
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is high.
Changes in the data line, while the clock line is high, will be interpreted as control
signals.
Accordingly, the following bus conditions have been defined:
2.1.1
Bus not busy
Both data and clock lines remain high.
2.1.2
Start data transfer
A change in the state of the data line, from high to low, while the clock is high, defines the
START condition.
2.1.3
Stop data transfer
A change in the state of the data line, from low to high, while the clock is high, defines the
STOP condition.
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