PT7C4307 Datasheet, PDF (14/20 Pages) Pericom Semiconductor Corporation – Real-time Clock Module (I2C Bus)

Preliminary Data Sheet
PT7C4307
Real-time Clock Module (I²C Bus)
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2) Read via I²C bus
a) Standard read
S
Slave address (7 bits)
write ^A
11010000
Addr. setting
A
Start
A
A
Slave address + write specification
C Address
C
K _{Specifies the read start address.}
K
Sr
Slave address (7 bits)
Read ^A
bit
7
bit
6
bit
5
bit
4
bit
3
bit
2
bit
1
bit
0
A ^{bit bit bit bit bit bit bit bit} /A
76543210
P
11 0 1 00 0 1
Restart
Slave address + read specification
A
C
Data read (1)
K _{Data is read from the specified start}
address and address auto increment.
A
C
Data read (2)
K _{Address auto increment to set the}
address for the next data to be read.
N Stop
O
A
C
K
b) Simplified read
S
Slave address (7 bits)
Read ^A
bit
7
bit
6
bit
5
bit
4
bit
3
bit
2
bit
1
bit
0
A ^{bit bit bit bit bit bit bit bit} /A
76543210
P
11 0 1 00 0 1
Start _{Slave address + read specification}
A
C
Data read (1)
K ^{Data is read from the address pointed}
by the internal address register and
address auto increment.
A
C
K
Data read (2)
Address register auto increment to set
N
O
Stop
the address for the next data to be
A
read.
C
K
Note:
1. The above steps are an example of transfers of one or two bytes only. There is no limit to the number of bytes transferred
during actual communications.
2. 49H, 4AH are used as test mode address. Customer should not use the addresses.
PT0206(02/05)
14
Ver: 0