Data Sheet

SD2405ALPI IIC 串行接口的实时时钟IC
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data reading condition.
3) After another bit’s ACK signal, it starts reading data normally.
4) When a byte data is read and CPU sends 1 bit ACK signal, a next byte data can be
read. Only when the 1 bit ACK signal which is sent by CPU is high voltage, can the
reading operation be stopped and then CPU sends stop signal.
Example 1 of data read (when data is read from 7H to 9H)
Ⅱ) The second method to reading data from the internal register is to start reading
immediately after writing to the slave address(0110010) and the (R/W) bit. Since the
internal address pointer is set to 00h by default, this method is only effective when
reading is started from the internal address 00h.
(5)Data Transmission Under Special Condition
The SD2405AL hold the clock tentatively for duration from start condition to stop
condition to avoid invalid read or write clock on carrying clock. To prevent invalid read or
write clock shall be made during one transmission operation. When 0.5 seconds
elapses after start condition any access to the SD2405AL is automatically released to
release tentative hold of the clock and access from the CPU is forced to be terminated
(automatic resume function from the interface).
Also a second start condition after the first condition and before the stop condition is