M34E04B datasheet(14/35 Pages) STMICROELECTRONICS

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Device operation

M34E04B

14/35

DocID028428 Rev 1

3.6.3

Minimizing system delays by polling on ACK

The sequence, as shown in Figure 6, 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).

Figure 6. Write cycle polling flowchart using 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 13, but the typical time is shorter. To make use of this, a polling sequence

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