參數(shù)資料
型號(hào)： S524LB0XB1
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： 32K/64K-bit Serial EEPROM
中文描述： 32K/64K-bit串行EEPROM
文件頁(yè)數(shù)： 11/20頁(yè)
文件大?。?/td> 145K
代理商： S524LB0XB1
DATA SHEET
S524LB0D91/B0DB1 SERIAL EEPROM
7-11
HARDWARE-BASED WRITE PROTECTION
You can also write-protect the entire memory area of the S524LB0D91/B0DB1. This write protection is controlled
by the state of the Write Protect (WP) pin.
When the WP pin is connected to V
CC
, any attempt to write a value to it is ignored. The S524LB0D91/B0DB1 will
acknowledge slave and word addresses, but it will not generate an acknowledge after receiving the first byte of
data. In this situation, the write cycle will not be started when a stop condition is generated. By connecting the
WP pin to V
SS
, the write function is allowed for the entire memory.
These write protection features effectively change the EEPROM to a ROM in order to protect data from being
overwritten. Whenever the write function is disabled, a slave address and word addresses are acknowledged on
the bus, but data bytes are not acknowledged.
CURRENT ADDRESS BYTE READ OPERATION
The internal word address pointer maintains the address of the last word accessed, incremented by one.
Therefore, if the last access (either read or write) was to the address “n”, the next read operation would be to
access data at address “n+1”.
When the S524LB0D91/B0DB1 receives a slave address with the R
/
W
bit set to “1”, it issues an ACK and sends
the eight bits of data. In a current address byte read operation, the master does not acknowledge the data, and it
generates a stop condition, forcing the S524LB0D91/B0DB1 to stop the transmission (see Figure 7-13).
Slave Address
Data
Start
A
C
K
N
O
A
C
K
Stop
Figure 7-13. Current Address Byte Read Operation
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