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PT7C4307

Real-time Clock Module (I2C Bus)

Pericom Semiconductor 

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

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