M95P16-EXCSSLASHEF datasheet(18/63 Pages) STMICROELECTRONICS

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5.2

Configuration and Safety register format

5.2.1

Configuration register

This register can be read with the RDCR instruction in loop mode. The two non-volatile bits DRV[1:0] can be

changed with the WRSR instruction when sending a second data byte. The MSB (b7) is sent first.

Table 7. Configuration register format

x(1)

DRV1

DRV0

x(1)

LID

1. x: Don't care bit.

The non-volatile DRV1 and DRV0 bits determine the output driver strength (RON of the buffer) for the read

operations. The values of DRV1 and DRV0 are given in Table 8.

The non-volatile LID bit determines if the identification page is locked or not. When LID = 0, the page can be

modified by the user. When LID = 1, the page is locked in read-only mode and cannot be changed. The LID

bit can be modified with a WRSR instruction when two data bytes are sent, see Section 6.8 Write Status and

Configuration registers (01h).

Table 8. Output driver strength

DRV1, DRV0

Buffer strength

RON (typical) at 3.3 V / 25 °C

RON (typical) at 1.8 V / 25 °C

0, 0

High

30 Ω

50 Ω

0, 1

Medium

110 Ω

200 Ω

1, 0

Low

175 Ω

300 Ω

1, 1

Default

50 Ω

90 Ω

Note:

The delivered state is with buffer strength "Default".

5.2.2

Safety register

This 8-bit register can be read with the RDCR instruction in loop mode.

All bits are volatile and are read-only. They can be reset with the CLRSF instruction.

Table 9. Safety register format

PAMAF

PUF

ERF

PRF

ECC1C

ECC2C

ECC3D

ECC3DS

Protected array modify attempt flag (PAMAF) bit

This bit indicates whether a modify operation to a protected memory area has been attempted:

•

0: clear

•

1: modify attempt detected

This is a sticky volatile bit that can be reset to 0 only by issuing Clear safety flag instruction. This flag is cleared to

0 after a successful power-up or by a Software reset instruction.

Power-up flag (PUF) bit

This bit indicates if power-up operation was completed successfully:

•

0: successful

•

1: error

This volatile bit is refreshed at each power-up, and after a Software reset instruction. The flag is cleared to 0 by

the Clear safety flag instruction.

M95P16-I M95P16-E

Configuration and Safety register format

DS13710 - Rev 1

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