X76F101

4

Figure 2. Data Validity

Figure 3. Definition of Start and Stop Conditions

Table 1. X76F101 Instruction Set

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.

Command

after Start

Command Description

Password

used

Sector Write

Write

Sector Read

Read

1 1 1 1 1 1 0 0

Change Write Password

Write

1 1 1 1 1 1 1 0

Change Read Password

Write

0 1 0 1 0 1 0 1

Password ACK Command

None

SCL

SDA

Data Stable

Data

Change

SCL

SDA

Start Condition

Stop Condition

PROGRAM OPERATIONS

Sector Write

The sector write mode requires issuing the 8-bit write

command followed by the password and then the data

bytes transferred as illustrated in figure 4. The write

command byte contains the address of the sector to be

written. Data is written starting at the first address of a sector

and eight bytes must be transferred. After the last

byte to be transferred is acknowledged a stop condition is

issued which starts the nonvolatile write cycle. If more or less

than 8 bytes are transferred, the data in the sector

remains unchanged.

ACK Polling

Once a stop condition is issued to indicate the end of the

host’s write sequence, the X76F101 initiates the internal

nonvolatile write cycle. In order to take advantage of the

typical 5ms write cycle, ACK polling can begin

immediately. This involves issuing the start condition