M95P16-IXCSSLASHEF datasheet(14/63 Pages) STMICROELECTRONICS

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Normally, the device is kept selected for the duration of the Hold condition. This ensures that the internal logic

state remains unchanged from the moment of entry into the Hold condition. Deselecting the device during the

Hold condition resets the state of the device. This mechanism can be used to reset the ongoing processes.

Note:

This resets the internal logic, except the WEL and WIP bits of the Status register.

The Hold condition starts when the HOLD signal is driven low when Serial clock (C) is already low (as shown in

Figure 6). If the falling edge does not coincide with C being low, the hold condition starts when C next goes low.

The Hold condition ends on the rising edge of the HOLD signal, if this coincides with C being low. If the rising

edge does not coincide with C being low, the hold condition ends when C next goes low.

Figure 6. Hold condition activation

Hold

condition

Hold

condition

HOLD

Figure 6 also shows what happens if the rising and falling edges are not timed to coincide with Serial clock (C)

being low.

To restart communication with the device, it is necessary to drive HOLD high, and then to drive chip select (S) low.

This prevents the device from returning to the hold condition.

4.11

ECC

The error correction code (ECC) is an internal logic function that significantly improves the data integrity of the

device. It is always active, and is transparent for SPI communication.

The ECC offers double-bit correction over 16 bytes (128 bits), and triple-bit error detection. When a 3-error

detection occurs, no correction is applied to the data. The single, double and triple error detection bits are

readable in the Safety register.

The ECC flag information is cumulative, meaning that on the same read instruction the flags are raised

as soon as a correction or a detection occurs, and all flags may be raised. The status bit is detailed in

Section 5.2.2 Safety register.

M95P16-I M95P16-E

ECC

DS13710 - Rev 1

page 14/63

M95P16-IXCS/EF Datasheet(PDF) 14 Page - STMicroelectronics