M24C64-R datasheet(20/42 Pages) STMICROELECTRONICS

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Instructions

M24C64-W M24C64-R M24C64-F M24C64-DF

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Doc ID 16891 Rev 27

5.2

Read operations

Read operations are performed independently of the state of the Write Control (WC) signal.

After the successful completion of a Read operation, the device internal address counter is

incremented by one, to point to the next byte address.

For the Read instructions, after each byte read (data out), the device waits for an

acknowledgment (data in) during the 9th bit time. If the bus master does not acknowledge

during this 9th time, the device terminates the data transfer and switches to its Standby

mode.

Figure 11.

Read mode sequences

5.2.1

Random Address Read

A dummy Write is first performed to load the address into this address counter (as shown in

Figure 11) but without sending a Stop condition. Then, the bus master sends another Start

condition, and repeats the device select code, with the RW bit set to 1. The device

acknowledges this, and outputs the contents of the addressed byte. The bus master must

not acknowledge the byte, and terminates the transfer with a Stop condition.

Dev sel *

Byte addr

Dev sel

Data out 1

AI01105d

Data out N

Current

Address

Read

Dev sel

Data out

Random

Address

Read

Dev sel *

Data out

Sequential

Current

Read

Data out N

Dev sel *

Byte addr

Sequention

Random

Read

Dev sel *

Data out1

ACK

R/W

NO ACK

ACK

R/W

ACK

R/W

ACK

NO ACK

R/W

NO ACK

ACK

R/W

ACK

R/W

ACK

NO ACK

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