Discontinued

Parts

9

CAT64LC10/20/40

Doc. No. 1021, Rev. C

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 WRITE

ALL operations. It does not reset any other operations

such as READ, EWEN and EWDS.

ERASE/WRITE ENABLE and DISABLE

The CAT64LC10/20/40 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 occured.

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.

Figure 8. EWDS Instruction Timing

SK

DI

CS

DO

RESET

10100000

HIGH-Z

HIGH

RDY/

BUSY