ADM1063ASU datasheet(30/36 Pages) AD

30 / 36 page

ADM1063

Rev. 0 | Page 30 of 36

•

To erase a page of EEPROM memory. EEPROM memory

can be written to only if it is unprogrammed. Before writing

to one or more EEPROM memory locations that are already

programmed, the page(s) containing those locations must

first be erased. EEPROM memory is erased by writing a

command byte.

The master sends a command code that tells the slave device

to erase the page. The ADM1063 command code for a page

erasure is 0xFE (1111 1110). Note that, for a page erasure

to take place, the page address must be given in the previous

write word transaction (see the Write Byte/Word section).

Also, Bit 2 in the UPDCFG register (Address 0x90) must

be set to 1.

SLAVE

ADDRESS

COMMAND

BYTE

(0xFE)

Figure 43. EEPROM Page Erasure

As soon as the ADM1063 receives the command byte,

page erasure begins. The master device can send a stop

command as soon as it sends the command byte. Page

erasure takes approximately 20 ms. If the ADM1063 is

accessed before erasure is complete, it responds with a

no acknowledge (NACK).

Write Byte/Word

In a write byte/word operation, the master device sends a

command byte and one or two data bytes to the slave device,

as follows:

The master device asserts a start condition on SDA.

The master sends the 7-bit slave address followed by the

write bit (low).

The addressed slave device asserts ACK on SDA.

The master sends a command code.

The slave asserts ACK on SDA.

The master sends a data byte.

The slave asserts ACK on SDA.

The master sends a data byte or asserts a stop condition.

The slave asserts ACK on SDA.

10. The master asserts a stop condition on SDA to end

the transaction.

In the ADM1063, the write byte/word protocol is used for

three purposes:

•

To write a single byte of data to RAM. In this case, the

command byte is the RAM addresses from 0x00 to 0xDF

and the only data byte is the actual data, as shown in

Figure 44.

SLAVE

ADDRESS

RAM

ADDRESS

(0x00 TO 0xDF)

W A

DATA

Figure 44. Single Byte Write to RAM

•

To set up a 2-byte EEPROM address for a subsequent

read, write, block read, block write, or page erase. In this

case, the command byte is the high byte of the EEPROM

addresses from 0xF8 to 0xFB. The only data byte is the low

byte of the EEPROM address, as shown in Figure 45.

SLAVE

ADDRESS

EEPROM

ADDRESS

HIGH BYTE

(0xF8 TO 0xFB)

SW A

EEPROM

ADDRESS

LOW BYTE

(0x00 TO 0xFF)

Figure 45. Setting an EEPROM Address

Note that for page erasure, because a page consists of

32 bytes, only the 3 MSBs of the address low byte are

important. The lower five bits of the EEPROM address

low byte specify the addresses within a page and are

ignored during an erase operation.

•

To write a single byte of data to EEPROM. In this case, the

command byte is the high byte of the EEPROM addresses

from 0xF8 to 0xFB. The first data byte is the low byte of the

EEPROM address, and the second data byte is the actual

data, as shown in Figure 46.

SLAVE

ADDRESS

EEPROM

ADDRESS

HIGH BYTE

(0xF8 TO 0xFB)

SW A

EEPROM

ADDRESS

LOW BYTE

(0x00 TO 0xFF)

DATA

Figure 46. Single Byte Write to EEPROM

Block Write

In a block write operation, the master device writes a block of

data to a slave device. The start address for a block write must

have been set previously. In the ADM1063, a send byte opera-

tion sets a RAM address, and a write byte/word operation sets

an EEPROM address, as follows:

The master device asserts a start condition on SDA.

The master sends the 7-bit slave address followed by

the write bit (low).

The addressed slave device asserts ACK on SDA.

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