24CS512 datasheet(21/66 Pages) MICROCHIP

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DS20005769C-page 21

24CS512

7.2

Random Read

Random read operations allow the host to access any

memory location in a random manner. To perform this

type of read operation, first the word address must be

set. This is done by sending the word address to the

24CS512 as part of a write operation (R/W bit set

to ‘0’). After the word address is sent, the host

generates a Start condition following the Acknowledge.

This terminates the write operation, but not before the

internal Address Pointer is set. Then, the host issues

the device address byte again but with the R/W bit set

to a logic ‘1’. The 24CS512 will then issue an

Acknowledge and transmit the 8-bit data byte. The host

will not acknowledge the transfer, but does generate a

Stop condition which causes the 24CS512 to

discontinue transmission (Figure 7-2). After a random

read operation, the internal Address Pointer will point to

the last word address location incremented by one.

FIGURE 7-2:

RANDOM READ

SCL

MSb

SDA

Word Address – Byte 1

Word Address – Byte 0

Device Address Byte

A15 A14 A13 A12 A11 A10 A9 A8 0 A7 A6 A5 A4 A3 A2

A1 A0

A2 A1 A0

ACK

from

Client

ACK

from

Client

ACK

from

Client

Device Address Byte

Data Byte (n)

D7 D6 D5 D4

A2 A1 A0

D3 D2 D1 D0 0

NACK

from

Host

ACK

from

Client

Stop by

Host

Start by

Host

Start by

Host

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