PT7C4372A Datasheet, PDF (25/30 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4372A/4372C
Real-time Clock Module (I²C Bus)
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
2) Read via I²C bus
a) Standard read
S
Slave address (7 bits)
write ^A
01 1 0 01 0 0
Addr. setting
0h~Fh
Transfer mode _A
00 00
Start
Slave address + write specification
A
A
C Address + transfer mode specification C
K _{1) Specifies the write start address;} K
2) Specifies the write mode (=0h fixed)
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
01 1 0 01 0 1
Restart
Slave address + read specification
indicating next byte will be read.
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)
write ^A
01 1 0 01 0 0
Addr. setting
0h~Fh
Transfer mode _A
01 00
Start
Slave address + write specification
A
A
C Address + transfer mode specification C
K _{1) Specifies the write start address;} K
2) Specifies the write mode (=4h fixed)
bit bit bit bit bit bit bit bit _A bit bit bit bit bit bit bit bit _{/A P}
76543210
76543210
Data read (1)
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
12-07-0001
PT0150-8 07/04/12
25