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M41T56 Folha de dados(PDF) 7 Page - STMicroelectronics |
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M41T56 Folha de dados(HTML) 7 Page - STMicroelectronics |
7 / 25 page M41T56 Operation 7/25 2 Operation The M41T56 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 64 bytes contained in the device can then be accessed sequentially in the following order: 1. Seconds register 2. Minutes register 3. Century/hours register 4. Day register 5. Date register 6. Month register 7. Years register 8. Control register 9. RAM The clock continually monitors VCC for an out of tolerance condition. Should VCC fall below VPFD, the device terminates an access in progress and resets the device address counter. Inputs to the device will not be recognized at this time to prevent erroneous data from being written to the device from an out of tolerance system. When VCC falls below VBAT, the device automatically switches over to the battery and powers down into an ultra low current mode of operation to conserve battery life. Upon power-up, the device switches from battery to VCC at VBAT and recognizes inputs when VCC goes above VPFD volts. 2.1 2-wire bus characteristics This bus is intended for communication between different ICs. It consists of two lines: one bidirectional for data signals (SDA) and one for clock signals (SCL). Both the SDA and the 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. |
Nº de peça semelhante - M41T56 |
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Descrição semelhante - M41T56 |
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