M24C04RBN3TG datasheet(15/34 Pages) STMICROELECTRONICS

Part #	M24C04RBN3TG

Description	16 Kbit, 8 Kbit, 4 Kbit, 2 Kbit and 1 Kbit serial I짼C bus EEPROM

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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15 / 34 page

M24C16, M24C08, M24C04, M24C02, M24C01

Device operation

15/34

Figure 8.

Write cycle polling flowchart using ACK

3.6.3

Minimizing system delays by polling on ACK

During the internal Write cycle, the device disconnects itself from the bus, and writes a copy

of the data from its internal latches to the memory cells. The maximum Write time (tw) is

shown in Table 15 and Table 16, but the typical time is shorter. To make use of this, a polling

sequence can be used by the bus master.

The sequence, as shown in Figure 8, is:

●

Initial condition: a Write cycle is in progress.

●

Step 1: the bus master issues a Start condition followed by a device select code (the

first byte of the new instruction).

●

Step 2: if the device is busy with the internal Write cycle, no Ack will be returned and

the bus master goes back to Step 1. If the device has terminated the internal Write

cycle, it responds with an Ack, indicating that the device is ready to receive the second

part of the instruction (the first byte of this instruction having been sent during Step 1).

WRITE Cycle

in Progress

AI01847C

Addressing the

Memory

START Condition

DEVICE SELECT

with RW = 0

ACK

Returned

YES

NO

YES

NO

ReSTART

STOP

DATA for the

WRITE Operation

DEVICE SELECT

with RW = 1

Send Address

and Receive ACK

First byte of instruction

with RW = 0 already

decoded by the device

YES

NO

START

Condition

Continue the

WRITE Operation

Continue the

Random READ Operation

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M24C04RBN3TG Datasheet(PDF) 15 Page - STMicroelectronics

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