PT7C4339 Datasheet, PDF (18/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4339/4339C
Real-time Clock Module
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5.5. I²C Bus’s Basic Transfer Format
S Start indication
P Stop indication
A RTC Acknowledge
Sr Restart indication
A Master Acknowledge
1) Write via I²C bus
S
Slave address (7 bits)
write ^A
11 0 1 00 0 0
Addr. setting
Start
Slave address + write specification
A
C Address
K _{Specifies the write start address.}
A ^{bit bit bit bit bit bit bit bit} A P
76543210
A
C Write data
K
A Stop
C
K
2) Read via I²C bus
(1) 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
11 0 1 00 0 1
A ^{bit bit bit bit bit bit bit bit} /A P
76543210
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
2015-08-0008
PT0508-1 08/24/15
18