CAT64LC40 Datasheet, PDF (8/12 Pages) ON Semiconductor – 4 kb SPI Serial EEPROM

CAT64LC40
Reset
The RESET pin, when set to HIGH, will reset or abort a
WRITE operation. When RESET is set to HIGH while the
WRITE instruction is being entered, the device will not
execute the WRITE instruction and will keep DO in High−Z
condition.
When RESET is set to HIGH, while the device is in a
clear/write cycle, the device will abort the operation and will
display READY status on the RDY/BSY pin and on the DO
pin if CS is low.
The RESET input affects only the WRITE and
WRITEALL operations. It does not reset any other
operations such as READ, EWEN and EWDS.
Erase/Write Enable and Disable
The CAT64LC40 powers up in the erase/write disabled
state. After power−up or while the device is in an erase/write
disabled state, any write operation must be preceded by an
execution of the EWEN instruction. Once enabled, the
device will stay enabled until an EWDS has been executed
or a power−down has occurred. The EWDS is used to
prevent any inadvertent over−writing of the data. The
EWEN and EWDS instructions have no affect on the READ
operation and are not affected by the RESET input.
RESET
SK
CS
DI
1 0 1 0 0 0 00
DO
RDY/BUSY
HIGH−Z
HIGH
Figure 9. EWDS Instruction Timing
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