S-93C46AMFN datasheet(8/53 Pages) SII

8 / 53 page

CMOS SERIAL E

2PROM

S-93C46A/56A/66A

Seiko Instruments Inc.

Figure 6 Read Timing (S-93C66A)

2. Write (WRITE, ERASE, WRAL, ERAL)

There are four write instructions, WRITE, ERASE, WRAL, and ERAL. Each automatically begins writing to the non-

volatile memory when CS goes low at the completion of the specified clock input.

The write operation is completed in 10 ms (tPR Max.), and the typical write period is less than 5 ms.

In the S-

93C46A/56A/66A, it is easy to VERIFY the completion of the write operation in order to minimize the write cycle by setting

CS to high and checking the DO pin, which is low during the write operation and high after its completion. This VERIFY

procedure can be executed over and over again.

Because all SK and DI inputs are ignored during the write operation, any input of instruction will also be disregarded.

When DO outputs high after completion of the write operation or if it is in the high-impedence state (Hi-Z), the input of

instructions is available. Even if the DO pin remains high, it will enter the high-impedence state upon the recognition of a

high of DI (start-bit) attached to the rising edge of an SK pulse. (see Figure 3).

DI input should be low during the VERIFY procedure.

D15

D14

D14 D13

D14

Hi-Z

A7A6A5A4A3A2A1A0+1

D13

D15

Hi-Z

A7A6A5A4A3A2A1A0+2

D13

S-93C46AMFN 数据表(PDF) 8 Page - Seiko Instruments Inc