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DS1305 Datasheet(PDF) 14 Page - Dallas Semiconductor

Part No. DS1305
Description  Serial Alarm Real-Time Clock
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1305 Datasheet(HTML) 14 Page - Dallas Semiconductor

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DS1305
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3-WIRE INTERFACE
The 3-wire interface mode operates similarly to the SPI mode. However, in 3-wire mode there is one I/O
instead of separate data in and data out signals. The 3-wire interface consists of the I/O (SDI and SDO
pins tied together), CE, and SCLK pins. In 3-wire mode, each byte is shifted in LSB first unlike SPI mode
where each byte is shifted in MSB first.
As is the case with the SPI mode, an address byte is written to the device followed by a single data byte
or multiple data bytes. Figure 9 illustrates a read and write cycle. In 3-wire mode, data is input on the
rising edge of SCLK and output on the falling edge of SCLK.
Figure 9. 3-WIRE SINGLE-BYTE TRANSFER
NOTE: IN BURST MODE, CE IS KEPT HIGH AND ADDITIONAL SCLK CYCLES ARE SENT UNTIL THE END OF THE BURST.
*I/O IS SDI AND SDO TIED TOGETHER.
A0 A1 A2
A3 A4
A5 A6
1
CE
SCLK
I/O*
D0
D1
D2
D3
D4 D5 D6 D7
SINGLE-BYTE WRITE
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A3
A4
A5 A6 0
I/O*
CE
SCLK
SINGLE-BYTE READ


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