13

AT34C02C [Preliminary]

5185A–SEEPR–9/06

does not respond with a zero but does generate a following stop condition (see Figure

14 on page 14).

SEQUENTIAL READ: Sequential reads are initiated by either a current address read or

a random address read. After the microcontroller receives a data word, it responds with

an acknowledge. As long as the EEPROM receives an acknowledge, it will continue to

increment the data word address and serially clock out sequential data words. When the

memory address limit is reached, the data word address will “roll over” and the sequen-

tial read will continue. The sequential read operation is terminated when the

microcontroller does not respond with a zero but does generate a following stop condi-

tion (see Figure 15 on page 14).

PERMANENT WRITE PROTECT REGISTER (PSWP) STATUS: To find out if the regis-

ter has been programmed, the same procedure is used as to program the register

except that the R/W bit is set to 1. If the device sends an acknowledge, then the perma-

nent write protect register has not been programmed. Otherwise, it has been

programmed and the device is permanently write protected at the first half of the array.

Table 10. PSWP Status

REVERSIBLE WRITE PROTECT REGISTER(RSWP) STATUS: To find out if the regis-

ter has been programmed, the same procedure is used as to program the register

except that the R/W bit is set to 1. If the sends an device acknowledge, then the revers-

ible write protect register has not been programmed. Otherwise, it has been

programmed and the device is write protected (reversible) at the first half of the array.

Figure 10. Device Address

Figure 11. Byte Write

Pin

Preamble

RW

Command

A2

A1

A0

B7

B6

B5

B4

B3

B2

B1

B0

Read PSWP

A2A1

A0

0

1

1

0

A2

A1A0

1