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DS1347_1202 Datasheet(PDF) 12 Page - Maxim Integrated Products

Part No. DS1347_1202
Description  Low-Current, SPI-Compatible Real-Time Clock
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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DS1347_1202 Datasheet(HTML) 12 Page - Maxim Integrated Products

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Low-Current, SPI-Compatible Real-Time Clock
12
______________________________________________________________________________________
SPI-Compatible Serial Interface
Interface the device with a microcontroller using a serial,
4-wire, SPI interface. SPI is a synchronous bus for
address and data transfer, and is used with Motorola or
other microcontrollers that have an SPI port. Four con-
nections are required for the interface: DOUT (serial-
data out); DIN (serial-data in); SCLK (serial clock); and
CS (chip select). In an SPI application, the device acts
as a slave device and the microcontroller acts as the
master. CS is asserted low by the microcontroller to initi-
ate a transfer, and deasserted high to terminate a trans-
fer. DIN transfers input data from the microcontroller to
the device. DOUT transfers output data from the device
to the microcontroller. A shift clock, SCLK, is used to
synchronize data movement between the microcon-
troller and the device. SCLK, which is generated by the
Alarm Minutes Register (1Bh)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
10 MINUTES
MINUTES
0
1
1
1
1
1
1
1
Alarm Hours Register (1Dh)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
AM/PM
12/
24
0
20 HR
10 HR
HOURS
1
0
1
1
1
1
1
1
Alarm Date Register (1Fh)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
10 DATE
DATE
0
0
1
1
1
1
1
1
Alarm Month Register (21h)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
0
10 MO
MONTH
0
0
0
1
1
1
1
1
Alarm Day Register (23h)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
0
0
0
DAY
0
0
0
0
0
1
1
1
Alarm Year Register (25h)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
10 YEAR
YEAR
1
1
1
1
1
1
1
1


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