AT34C02 Просмотр технического описания (PDF) - Atmel Corporation

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AT34C02

2-Wire Serial EEPROM with Permanent Software Write Protect

Atmel Corporation 

AT34C02

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 sequential read will con-

tinue. The sequential read operation is terminated when

Figure 2. Device Address

the microcontroller does not respond with a zero but does

generate a following stop condition (refer to Figure 7).

WRITE PROTECT REGISTER STATUS: To find out if the

register 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 acknowledges, then the 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.

Figure 3. Byte Write

Figure 4. Page Write

Figure 5. Current Address Read

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