Philips Semiconductors

PCF85116-3

2048

Product data

Rev. 04 — 25 October 2004

7 of 21

9397 750 14217

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

After the receipt of each data byte, the six high-order bits of the memory address

providing access to one of the 64 pages of the memory remain unchanged. The five

low-order bits of the memory address will be incremented only (see Figure 4). By

these five bits a single byte within the page in access is selected. By an increment the

memory address may change from 31 to 0, from 63 to 32, etc. If the master transmits

more than 32 bytes prior to generating the STOP condition, data within the addressed

page may be overwritten and unpredictable results may occur. As in the byte write

operation, all inputs are disabled until completion of the internal write cycles.

Remark: Write accesses to the EEPROM are enabled if the pin WP is LOW. When

WP is HIGH the EEPROM is write-protected and no acknowledge will be given by the

PCF85116-3 when data is sent. However, an acknowledge will be given after the

slave address and the word address.

Fig 4.

Auto-increment of memory address.

B2

B3

B1

WORD ADDRESS

002aaa288

read: auto increment

write: unchanged

write: auto increment

Fig 5.

Auto increment memory address; two byte write.

S

1010

0

B1

B2

B3

A

WORD ADDRESS

AA

DATA

P

SLAVE ADDRESS

acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

A

DATA

R/W

auto increment

word address

auto increment

word address

 === '