X76F641

4

Figure 2. Data Validity

Figure 3. Definition of Start and Stop Conditions

Table 1. X76F641 Instruction Set

Notes: Illegal command codes will be disregarded. The part will respond with a “no-ACK” to the illegal byte and then return to the standby mode.

All write/read operations require a password.

1st Byte

after Start

1st Byte

after

Password

2nd Byte

after

Password

Command Description

Password

used

1000 0000

High Address

Low address

Read (Array 0)

Read 0

1000 1000

High Address

Low address

Read (Array 1)

Read 1

1001 0000

High Address

Low address

Sector Write (Array 0)

Write 0

1001 1000

High Address

Low address

Sector Write (Array 1)

Write 1

1010 0000

0000 0000

0000 0000

Change Read 0 Password

Read 0

1010 1000

0000 0000

0000 0000

Change Read 1 Password

Read 1

1011 0000

0000 0000

0000 0000

Change Write 0 Password

Write 0

1011 1000

0000 0000

0000 0000

Change Write 1 Password

Write 1

1100 0000

0000 0000

0000 0000

Change Reset Password

Reset

1110 0000

not used

not used

Reset Password Command

Reset

1110 1000

not used

not used

Reset Device Command

Reset

1111 0000

not used

not used

ACK Polling command (Ends Password operation)

None

All the rest

Reserved

SCL

SDA

Data Stable

Data

Change

7025 FM 04

SCL

SDA

Start Condition

Stop Condition

7025 FM 05

7025 FM T04