AT93C56A-10PI-1.8 查看數據表（PDF） - Atmel Corporation

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AT93C56A-10PI-1.8

3-wire Serial EEPROMs

Atmel Corporation 

WRITE (WRITE): The Write (WRITE) instruction contains the 8 or 16 bits of data to be

written into the specified memory location. The self-timed programming cycle tWP starts

after the last bit of data is received at serial data input pin DI. The DO pin outputs the

READY/BUSY status of the part if CS is brought high after being kept low for a minimum

of 250 ns (tCS). A logic “0” at DO indicates that programming is still in progress. A logic

“1” indicates that the memory location at the specified address has been written with the

data pattern contained in the instruction and the part is ready for further instructions. A

READY/BUSY status cannot be obtained if the CS is brought high after the end of

the self-timed programming cycle tWP.

ERASE ALL (ERAL): The Erase All (ERAL) instruction programs every bit in the mem-

ory array to the logic “1” state and is primarily used for testing purposes. The DO pin

outputs the READY/BUSY status of the part if CS is brought high after being kept low for

a minimum of 250 ns (tCS). The ERAL instruction is valid only at VCC = 5.0V ± 10%.

WRITE ALL (WRAL): The Write All (WRAL) instruction programs all memory locations

with the data patterns specified in the instruction. The DO pin outputs the READY/BUSY

status of the part if CS is brought high after being kept low for a minimum of 250 ns (tCS).

The WRAL instruction is valid only at VCC = 5.0V ± 10%.

ERASE/WRITE DISABLE (EWDS): To protect against accidental data disturb, the

Erase/Write Disable (EWDS) instruction disables all programming modes and should be

executed after all programming operations. The operation of the READ instruction is

independent of both the EWEN and EWDS instructions and can be executed at any

time.

Timing Diagrams

Synchronous Data Timing

Note: 1. This is the minimum SK period.

6

3378F–SEEPR–04/04

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