24CSM01-ESLASHP datasheet(23/63 Pages) MICROCHIP

23 / 63 page

 2023 Microchip Technology Inc. and its subsidiaries

Preliminary

DS20006781B

-page 23

24CSM01

9.0

CONFIGURATION REGISTER

The 24CSM01 device contains a 16-bit Configuration

address

and

word

address.

desired,

the

Configuration register can be locked so that it is set to

read-only and can no longer be modified, thereby

making the current data protection scheme permanent.

9.1

Accessing the Configuration

The value of the Configuration register can be

determined by executing a random read sequence to a

specific

address.

Changing

the

value

the

Configuration register is accomplished with a byte write

sequence with the requirements outlined later in this

section.

Accessing this register requires the use of ‘1011b’ (Bh)

as the device type identifier in the device address (see

Table 9-1). Following the device type identifier are the

hardware client address bits for which the values are

determined by the device address input pins, A2 and

A1 (see Section 2.0 “Pin Descriptions”). Next, the

MSb of the word address, which is a “don't care” for the

Configuration register, is sent to the device. Finally,

bit 0 is the Read/Write Select (R/W) bit, where a logic

‘1’ is used for reading and a logic ‘0’ is used for writing.

When accessing the Configuration register, a 16-bit

word address must be sent to the device. All bits in the

word address are ignored except for bits A15, A11 and

A10. Bits A15 and A11 must be set to logic ‘1’ and bit

A10 must be set to logic ‘0’. Refer to Table 9-2 and

Table 9-3 for additional information.

TABLE 9-1:

CONFIGURATION REGISTER DEVICE ADDRESS BYTE

Memory Region

Device Type Identifier

Hardware

Address Bits

Memory

MSb

Read/Write

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

A16

Bit 0

Configuration Register

1011

R/W

TABLE 9-2:

CONFIGURATION REGISTER WORD ADDRESS BYTE 0

Word Address

A15

A14

A13

A12

A11

A10

Word Address Byte 0

1xxx10x

TABLE 9-3:

CONFIGURATION REGISTER WORD ADDRESS BYTE 1

Word Address

Word Address Byte 1

xxxxxxx

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